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【多选题】
下列有关水泥的说法正确的是( )。A.
水泥时间不合要求，该水泥报废
B.
水泥的水化热主要在后期释放
C.
安定性不合格的水泥不可用于工程，应废弃
D.
水化热对大体积混凝土工程不利
E.
粉煤灰硅酸盐水泥适用于有抗碳化要求的工程
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反馈参考答案：
举一反三
【单选题】When do you start eating?
A.
As soon as you arrive at the lunch or dinner.
B.
As soon as everyone is served.
C.
When a speech is being made.
D.
When the host begins eating.
【简答题】有一星形连接的三角对称负载，已知各相电阻6欧，电感25.5毫亨，现接在380伏线电压，频率为50周/秒三相电源上，求通过每相负载的电流和三相平均功率多少？
【单选题】Materials which is applicable to a system as a whole uses zeros in the _______ element(s) of the ASN.
A.
2nd
B.
3rd
C.
2nd & 3rd
D.
1st & 2nd
【单选题】Which of the following materials is a good insulator?
A.
Steel.
B.
Aluminum.
C.
Glass.
D.
Copper.
【单选题】Which of the following materials is a good insulator?
A.
steel
B.
aluminum
C.
glass
D.
copper
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