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【单选题】
钢筋混凝土柱的设计强度等级为C30，使用中砂、粒径40mm以内的石子、32.5级普通硅酸盐水泥，单位用水量170kg/m3，水灰比0.50，选用砂率34%，混凝土表观密度 2400kg/m3，则用砂量约为( )kg/m3。A.
643
B.
816
C.
1074
D.
1243
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举一反三
【单选题】—Jack hurt his arms while playing basketball yesterday afternoon. —________. [ ]
A.
Never mind
B.
That's all right
C.
That's nothing
D.
I'm sorry to hear that
【单选题】In the hospital,____________.
A.
the doctor tells Jack that he is seriously ill
B.
Jack tells the doctor that he is running a high fever
C.
the doctor wants to see if Jack’s lungs are all right
D.
Jack tells the doctor that he’s hurt his body badly
【单选题】Jack hurt his leg yesterday. Now he is in the hospital. ____________
A.
It’s my pleasure.
B.
All right.
C.
I’m sorry to hear that.
【简答题】实时系统与分时及批处理系统的主要区别是()性和()性。
【简答题】五、词汇运用 （一）根据汉语或首字母提示用所学单词的正确形式完成下列句子。（每小题1分，共10分） 1. The manager said to the worker, “Get to work or ______________ (辞职) right now.” 2. The professor instructed his students to ______________ (服从) the...
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