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【单选题】
钨极氩弧焊按照电流种类分类可分为交流电源、( )、交直流两用电源及脉冲电A.
混合电源
B.
直流电源
C.
半波电源
D.
高频电源
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举一反三
【单选题】听力原文：How did you sleep last night, darling? (A) Oh, I had a sound sleep. (B) I read some novels after supper. (C) Yes, the floor is too slippery. (11)
A.
B.
C.
【单选题】What was the parrot’s response when John shook him?
A.
He became politer.
B.
He got even ruder.
C.
He remained the same.
D.
He laughed and ignored him.
【单选题】Billy: Hi, I'm Billy. You're a new student, aren't you? Sandy: Yes, I am. My name is Sandy. And this is my sister. Billy: Hello!My name is Billy. What's your name? Sue: Nice to meet you. I'm Sue. What...
A.
Classmates.
B.
Friends.
C.
Brothers.
D.
Brother and sister.
【简答题】What happened in the 1950s and 60s that changed how people viewed the blues?
【单选题】下列对糖果中还原糖测定说法不正确的是( )
A.
滴定时保持沸腾是防止次甲基兰被空气氧化
B.
滴定终点显示砖红色是 Cu 2 O 的颜色
C.
可用澄清剂除去蛋白质和有机酸的干扰
D.
用中性乙酸铅作澄清剂时可让过量铅留在溶液中
【单选题】听力原文： Mrs. Robinson had one small, son. His name was Billy. Mrs. Robinson loved Billy very much, and as he was not a strong child, she was always afraid that he might get ill, so she used to take him ...
A.
Because he was ill.
B.
Because he was rather weak.
C.
Because he was always afraid.
D.
Because she loved him.
【简答题】what( )
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