在一定压力下,气体在水中溶解度随温度升高而降低,因此,升温对脱硫不利。
参考答案:错
When Alice came to life, she did not know how long she ________ there.[ ]
A. had been lying
B. has been lying
C. was lying
D. has lain
下列中断中,______不属于强迫性中断。
A.设备出错
B.掉电
C.时间片到时
D.执行print语句