【单选题】Why does Michael need Dave’s report?
A.
He needs to review before they submit it.
B.
He wants to know if Dave works hard.
【判断题】降压变换器(BUCK)的开关管工作频率越高,变换器电感值可以设计得越小。
【判断题】由于臭氧对紫外线的强烈吸收,且离地面较远,平流层的气温随高度增加而升高。
【判断题】HXD3型电力机车空气压缩机组设有无负荷启动装置、高压保护装置、低温加热装置。
【判断题】对流层的温度变化主要特征是气温随高度增加而升高。()
【单选题】What’s Dave’s plan for the weekend?
A.
He wants to hang out with his friends at the lake.
B.
He wants to invite Dave to his house for dinner.
C.
He wants to invite Dave to go to the movies on Sunday.
D.
He wants to go to the boxing class with Dave.