He didn't understand the point, ______ I had to explain further.
A. which
B. while
C. whereupon
D. that
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After practicing for one month, I ______ the conclusion that I didn't really fancy civil engineering.
A. derived from
B. came to
C. built up
D. based on
She was speaking to a crowd when she _____ someone called her behin.
A. hear
B. would hear
C. heard
D. had heard
压缩机的安全操作要求要点主要有____。
A. 压缩机在运行中不能中断润滑油和冷却水
B. 经常检查闸门、设备和管道的法兰连接、焊接处和密封处等部位
C. 严禁空气与易燃性气体在压缩机内形成爆炸性混合物
D. 严密注意设备的压力变化，通过排气等措施，及时调节压力
能够提供土的静止侧压力系数的原位测试试验是（）。
A. 十字板剪切试验
B. 自钻式旁压试验
C. 平板静载荷试验
D. 扁铲侧胀试验
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