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题目内容
（甘肃开放大学高等数学）
函数y={x^2+3,x>0,cosx,x<=0的间断点是x=0A.对
B.错
<img src="data:image/png;base64,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" >
B.错
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAARQAAABACAYAAADbGIgsAAAJuklEQVR4Xu1dO28USRCu/QMXX4QQ2EhY/gU2EHAJxgkRIoOIFSQmgcgR2gSceKUT0hJBhix0QjoZExGxjgkQAV7ITrr4/oBvenZ6d6bdj+qeGu9jvk2O83RXd39V/XV19atzmv0IPyAABICAAAIdEIoAihABBIBAjgAIBYYABICAGAIgFDEoIQgIAAEQCmwACAABMQRAKGJQQhAQAAIgFNgAEAACYgiAUMSghCAgAARAKLABIAAExBAAoYhBCUFAAAiAUGADQAAIiCEAQhGDEoKAABAAocAGgAAQEEMAhFKC8qjboduvN2j/ZEg7K2IYQxAQaA0CIJRc1UfU7dwm+nhKg63W6B4NBQLiCIBQMkhH/U3auzJMIJMxEb3OZGzsn9AQbo24gULgYiEAQlH+SXeTfjyNn+aM+n062dmhrdzD+UB3TgfZv/EDAu1FAISSE0qXaFCPDFJJqb2mh5YvIwIgFClCybyV1cxbqR/LnU6jlME9XOC4jppKrj45zvvNIrdjGTt+U20CoUgQylGXujRIiMGYaq1OncYdcj2LFdfznpoyHq/cDJNxnFvVHUHvmehgBoWCUOoSiuo4H+7QaXB5aET9zT26MvSQw2hEo5WVkpejOmKP1hZuGVu1dZW+75ZWzRROvTU6GUp4cTPoKSiShQAIpQahlF36sFvPIBRTZaM+be5doWGQrFi6Tk/EJs2iCFXv1QO6WyZC29/Sa4Scc4oACMVHKLnbni8KTze76b9t7EeOtpGEojrgfaK3TY3osW3T6R9+DHtjlemOtnxMe+aUA0SrBUJheCi5J/J9l07Wevl/w9Mbm474hFL1fB42GkOJbhuHUEEoop10kYSBUBiEku18y1z4J5S5KVGb18Zb+T3mEBjtNbE0umkusW0ak2OyEJ6NUIpy1hd41WqROvas6gpC4RAKWYKM0RrjeyhT0eNyD+7GEVlc1RLbVhDE8UY2HdzNNgWWd/QhhhKngiVKDUJhEMqo36W979+yLfap0x1lMSmEojbddejDnebOGEW3bUIkvhjSWZLKva2Du5FxpyXqaS1pCgglU/Tzq7/TP3//SwPbrrTMfd/88ZSG24eTICllBHO4PYg8kZxAKOcQmGW3jRM7KXeayjIxArIt4ZPwy4GdTseLhe9pZJXX9t3191mBbiOUSWB0EucYj7pq42daTINBKJOVlwKJ8kqS9gxsMYtI4KLbFrtsXNQnZqeszSZCdhL67oPFl1fbfIpt28oM9SGVZ1meGE/2UDhkUU7j+ndkX2gk+UKdwznqU391J9I7agQ2UaEphKIqoPOFOq3qsD4bLOfndO4YMgulDX0XBbphYUFCCSna972s7LKS5g3AxSCU4owPZx9Iw0YjLd43OJllmZ2dY0sm6ZTJxWWjoTb6CMxWx5A8DomFZMR8//XrF12+fDnP8uLFC3r27FlMdmdaJ6FwvAtbGg7QZprzBrOKBmMqIgI1hHCnA6Y3ofOlerkmadi8EQ4xlesfkz6UNvS9CctZyY54vHnzhq5du0a3bt2iBw8e0L1792oXxSIU07W0KdwExeVCphpF7Za6BMzL9vbGGjjfgl12E4q9mXZka6WWYfNCbOXGDGwxJOAbZHW9Y8o2iY2rYV3Gu3fvcjL59OlTntX8f6486wCRFXLqGjlCSnUxtm1EMJVbJilb+ZNNYeXApPQBM2l5dTTR0rwxHZvjNfu8GVfH1gOkj5S0vYbUlEoMPrm63kq2nqo8evSIXr16FaqO9fvjx4/p4sWLk2mOlilRd3EPxad01Trb/NWJypkdl9n0pHtI24PqidX4HanFis0641xKksqQiYuAj1C432zegms6bhvYzMHN5X2EvBKfl87Fw9WpFQncuHGj4llwZZrp1BTn5s2bZwjl58+fdOnSpVSxeT4WoXBGhpSRJqSg8fbu8qnVI+r3V2lH6O5WfY4l7WxOLdyRuUDA5jW4AvihwcoE1TXlCcVQpAjFpeSg3Vsyfvnyha5fv04SnX6mhBIiCtv0huM6ugJv1bzVDVHTO1wF+6PeuCZEUoI1a4Uorn35vIgYD8XlJXNieyEi4BJRSI5N8a5pCSc+o+Vpgp2LKY+uVApoLqMJA1silNU+dQ+3aWDp+PFTnrLKsMozS+YKEUq5bhxP2Wan5qBXJiffNxMXTuflxB1DXplNHy9fvqTPnz/T7u5uvjJT5zcXQVmbm+hTth4JzJElRExVoPThuH1aPyB62tDdIBKXVNdRcJvzShGKzyvmkAbHQ0nVU0wbXd7J+/fvJ58uXLhQe4lX1UlPn9QScq/XOyNT9/mYYC0rhsIB0uV2lonFRUBu+Xq7e7N3gizGxjaOFhYvTUxnS+30EoTC9Y5C0y/XAOvSnOrs6jfKrgfVcZQ6Kzy6HM7GNnFCiTVPM5imySR9ypOdtj06oq2tZl+7AaHEaloufYz7L0kovsEtlhR8pMghMzk0Zy8puPWeW8UycDavxAasla0nJ2y36dC86Jhbmch0IJRIwASTczwU20gZjr+Nz/noH3evic0mQwTDHTBTYzCCcDcuSoxQxGo6OVV7fo+WP7/6G3398z/66w+xVkCQctPxLk/r7GD+CGUGKoCHkga6dx8P3uVJA3XBc4FQMgWCUOKs+Ox9KmZ+vMsTh+jypAahgFDY1qz3+wQvmMKdsmxMly0hCIVFKNPb2nIDqNxJYnwz3usJPokR+z6OlAWyy522j/0+MZ7RkNLSwskBoQQJxXDf887yrXj4y7yVvuh8VFzgbNwJ6zs6EP0+jpCpBcstXUsJQhECfYnFgFBChOK74iD0/kx2XEC953PMuWUt9X2cusYZUS57yhPCpdltRXURQf4aCIBQAoTie/5hPJ1ZN172G58/+qYfBZssg5tTJUYgs4Zi+Vnj3+UJPkCGGAof/iVLCULheCi3yf4caDEdqE4FHE9GWNNOrSn6fRwhQ6xTrnvZGO/yCKln4cSAUEKEQpbLobMReHzymYqnNaZnjSoeTZauf5LdUF+4+GrK0FuzvAIo9vZPpP01WS7e5YlUxnIkB6EECUUpuiAVrfPKSo5nlac83VF5jVhK8H0c9biYisEIvMVTNtdguaUrIqqrVBaj98SHsFN2OUgiphUgFBahxEDaQNolfYunAaQgcsYIgFDmmlCW9y2eGds9im8IARBKPqMp3i/GNZANmRnEtgUBEEquaRUHuU/0drh0T3y2xZDRzvlAAIQy0YMOrp7ftQnzYQKoBRCQQwCEIoclJAGB1iMAQmm9CQAAICCHAAhFDktIAgKtRwCE0noTAABAQA4BEIoclpAEBFqPAAil9SYAAICAHAL/A0E+ybkhs2bYAAAAAElFTkSuQmCC" >
参考答案