荧光渗透探伤中,黑光灯的主要作用是()
A、放大显示
B、使显示可见
C、使显示显现
D、加快探伤速度
参考答案:B
给下面的单词选出对应的图片,并标号。
( ) A. The window is blue. A goose is out of the window.
( ) B. The desk is green. There is a bee on it.
( ) C. There is a red elephant in the picture.
( ) D. A yellow duck is on the floor.
( ) E. An orange dog is sitting in front of the door.
关于热力学定律,下列说法正确的是[ ]
A.在一定条件下物体的温度可以降到0 K
B.物体从单一热源吸收的热量可全部用于做功
C.吸收了热量的物体,其内能一定增加
D.压缩气体总能使气体的温度升高