热紧螺栓应按制定的顺序进行,加热后一次进到规定值,如达不到规定值,应强力猛紧待规定值。()
参考答案:错
The teacher always waits until all the children ______ before he starts the lesson.
A.get down
B.set down
C.put down
D.settle down
我国现有耕地面积占全球耕地的7%,而人口却占世界人口的()
A.32%
B.20%
C.22%
D.30%