当液氨罐内压力达到（）MPa时，就要投用喷淋水。
A.1.5
B.1.4
C.1.6
D.1.7
参考答案：B
I hate people ______ talk much but do little. [ ]
A. who
B. which
C. whose
D. whom
市话全塑电缆按芯线绝缘材料分为（）种。
A、2
B、3
C、4
D、5
