The doctor said that mental （） is the major cause of his sleeping problem.
A. tension
B. sadness
C. anger
D. relaxation
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若用每日慢4min的一个时钟来计时间，其计时误差就是（）。
A. 缓慢改变
B. 系统误差
C. 随机改变
D. 目测改变
The best way to determine if a load is within maximum lift limits is to use（）.
A. a boom angle indicator
B. a load weight indicator
C. material invoices for shipping weights
D. prior experience with similar lift
（） difficulties they may come across, they"ll help one another to overcome them.
A. Whatever
B. Whenever
C. However
D. Wherever
Although it"s tough finding a job these days, Henry got a （） in a famous company.
A. place
B. position
C. post
D. patch
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