公立医院属于0.5%60元封顶扣率的商户。()
参考答案:错
If you don't know the answer ________ something, you______say "I'm sorry." [ ]
A.of;must
B. to;may
C. to;will
D. of; can't
如图14-3-3(a)所示结构截面A、B间的相对转角妒AB为()。
A.A
B.B
C.C
D.D