曲线y=(x-1)2(x-3)2的拐点个数为______．
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石痈的记载最早见于：
A. 《诸病源候论》
B. 《仁斋直指附遗方论》
C. 《后备急方》
D. 《外台秘要》
E. 《千金方》
What does the woman Want the man to do
A. She wants the man to listen to the instructions and observe.
B. She wants the man to watch white she performs the operations.
C. She wants the man to ask questions so that she can help him.
D. She wants the man to try to do it while she gives him instructions.
硝酸甘油的不良反应主要由下列何项所致
A. 心输出量减少
B. 消化道刺激
C. 肝功能损害
D. 血管舒张
E. 低血钾
若曲线y=x2+ax+b和2y=-1+xy3在点(1，-1)处相切，其中a，b是常数，则______．
A. a=0，b=-2
B. a=1，b=-3
C. a=-3，b=1
D. a=-1，b=-1
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