弯管后管壁减薄率不得超过（ ）。
A．8%
B．10
C．15%
D．20%
参考答案：C
—The radio is too noisy. _____ , please.
—All right. I'll do it.[ ]
A. Turn it off
B. Turn it on
C. Open it
D. Close it
某ICU共有10张床位，则该ICU总面积至少应为（）
A.500m2
B.100m2
C.150m2
D.200m2
E.300m2
