流体并流换热的特点（）。A、冷流体受热后的极限温度高于热流体最终温度 B、并流传热初

Most of the children enjoy _______________ computer games. [ ]

A. play

B. playing

C. played

D. to play

急性肾炎重症病例多在起病1～2周内出现（）

A.休克

B.低钾血症

C.多饮

D.多尿

E.严重循环充血

My parents ________ newspapers after supper.

A．both read

B．all read

C．read both

D．read all

分子筛吸附净化流程的空分设备在短期停车后重新恢复启动时应注意什么问题？