形态学和切线理论在BIAS上也可以适用,比如顶背离和底背离的原理。()
参考答案:对
Getting out of the crowded bus, ______
A.her cell phone was found missing
B.her cell phone was nowhere to be found
C.she found her cell phone missing
D.Her cell phone couldn’t be found
气密试验时间要求大于12小时。