问题 单项选择题

如果煤的制样和化验方差为0.20,某一批次煤采样精密度为±2.0%时,子样数目为60个,那么如采样精密度为±1.5%时,所需采取的子样数目为()。

A.133

B.45

C.107

D.80

答案

参考答案:C

听力题

单词拼写或短语翻译(共15小题,每小题1分,满分15分)

小题1:When learning English, it is quite important to develop the ability of_________ (交际).

小题2:Failing in the examination again ___________ (心烦意乱) her a lot.

小题3:When we are in other countries, we should respect the ___________ (文化) there.

小题4:I am so _________ (熟悉) with him that I recognized his voice the moment I picked up the telephone.

小题5:Without ____________ (电),modern life would be very difficult.

小题6:What’s your _______ (态度) to wearing jewelry to school?

小题7:He looks handsome and gentle, but _________  (实际上) he is a thief.

小题8:What is the _________ (原因) for your absence of yesterday’s meeting?

小题9:“____________(公寓) ” is often used in American English while “flat” is used in British English.

小题10:__________ (判断)from his appearance, the manger must be over fifty.

小题11:刚开学的那天,我们的老师就给我们提了一些学习英语的建议。

On the very first day of school, our teacher __________ us some ___________ on English learning.

小题12:大多数下岗的人员都是文化不高的人。

Most of the people who _________  ________  ________  ________ usually have little education.

小题13:别灰心, 你会成功的。

Don’t ________  ________. You will succeed.

小题14:大学尚未毕业,他就创办了自己的公司。

He _______  _________ his own company before graduating from college.

小题15:只有通过努力拼搏, 才能实现自己的梦想。

Only by working hard __________ you ____________ your dream.

判断题