乙炔站房内的仪表必须应用( )型仪表。
A.防尘
B.防水
C.防爆
D.数字
参考答案:C
某班同学在用光学显微镜观察装片时,由于突然停电导致视野偏暗.在如下所采取的措施中,较为合理的是( )
A.将凹面镜转换成平面镜
B.使用遮光器上的更大光圈
C.调节粗准焦螺旋
D.调节细准焦螺旋
Our English teacher devoted herself _____ to her teaching and it earned her a good reputation in our school.[ ]
A. strongly
B. extremely
C. entirely
D. freely