压裂的泵注程序中胶联剂通常在（）加入。
A.施工全过程
B.前置胶液和混砂液段
C.混砂液段
D.混砂液和替置液段
参考答案：B
In much of the animal world, night is the time ____ for sleep —pure and simple.
A．set aside
B．set down
C．set off
D．set up
A cache has 64 blocks; each block is 16 bytes. Which block does byte 1200 map to
A．25
B．60
C．75
D．100
