喷射混凝土的水灰比一般在（）之间。
A、0.35～0.4
B、0.4～0.5
C、0.45～0.55
D、0.5～0.6
参考答案：B
Mr Smith, ________ of the ________ speech, started to read a novel. [ ]
A. tired; boring
B. tiring; bored
C. tired; bored
D. tiring; boring
IgE与细胞表面FcεRI结合的部位
A．CH4
B．CH3
C．CH1
D．CH2
E．VH
