高速钢刀具刃部能保持高硬度的最高工作温度是()。 A.250~300℃ B.350~

题型:单项选择题

问题:

高速钢刀具刃部能保持高硬度的最高工作温度是()。

A.250~300℃

B.350~450℃

C.500~550℃

D.600~650℃

考点:金属工艺学合金钢合金钢题库
题型:单项选择题

Complete the sentences with the given words in their proper forms (用括号中所给单词的适当形式完成下列句子。每空格限填一词) (共8分)

小题1:The prices of many__________ usually go up during festivals.(flower)

小题2:This is the__________ time for our school to hold the robot-making contest.(six)

小题3:I could hardly believe she had made a video about water pollution by__________.(her)

小题4:The company hopes its new product will be__________ on the European market.(success)

小题5:Larry has put on too much weight because of his__________ diet.(healthy)

小题6:Jack finds it difficult to pronounce some English words__________.(correct)

小题7:Don’t use the lift when you escape from a high__________ during a fire.(builD.

小题8:It is not wise of young people to__________ their jobs from time to time.(changeable)

题型:单项选择题

—It's 10 o'clock now. I must go.

—It's raining heavily outside. Don't leave ______ it stops. [ ]

A. since

B. until

C. when

D. because

题型:单项选择题

大剂量糖皮质激素突击治疗用于

A.肾病综合征
B.霉菌性口炎
C.肾上腺皮质次全切除后
D.慢性肾炎
E.中毒性菌痢

题型:单项选择题

英、红、燕三个人讨论一数学题,当她们都把自己的解法说出来以后,英说:“我做错了。”红说:“英作对了。”燕说:“我做错了。”老师看过她们的答案并听了她们的上述意见后说:“你们三个人有一个做对了,有一个说对了”。
  那么,谁做对了呢( )。

A.红

B.英

C.燕

D.不能确定

题型:单项选择题

将一盏电灯放在桌子上代表太阳,在电灯旁放置一个地球仪代表地球,拨动地球仪模拟地球运动。读图回答下列小题。

图示时间内,P地()

A.盛行东北信风

B.正午太阳高度达全年最大值

C.当地时间6时日出

D.此日过后白昼逐日变长

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