空分设备和食品发酵设备中经常使用的吸附器,是由两台分子筛罐交替吸附(交替承压),属于疲劳设备,疲劳设备一般容易产生疲劳裂纹。()
参考答案:对
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
— Oh, dear ! She ______ a lot of difficulties !
A.may go through
B.might go through
C.ought to have gone through
D.must have gone through
压力的心理反应是相当自动与可预测的,而且在一般状况中,我们是不能用意识来控制的。