A.对
B.错
[单选题]A.50°B.160°C.337°D.-23°
[单选题]A.28650B.27000C.28800D.28500
[单选题]A.2B.1C.4D.0.25
[单选题]A.青霉素G40万U,肌注,每天3次B.青霉素G首剂160万U,肌注,然后改40万U,每天3次C.青霉素G首剂480万U,快速静滴,然后改40万U,肌
[单选题]A.f(0)=1为f(x)的极小值B.f(0)=1为f(x)的极大值C.(O,f(0))为曲线y=f(x)的拐点D.由g(x)才能确定f(x)的极值或