问题
单项选择题
离心泵整个试验总的延续时间，不超过（）。
A.5h；
B.2～3h；
C.1h；
D.0.5h。
答案
参考答案：B
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离心泵整个试验总的延续时间，不超过（）。
A.5h；
B.2～3h；
C.1h；
D.0.5h。
参考答案：B
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| Today is March 7th, and tomorrow is 1 . Doris wants 2 her mother something. She 3 10 dollars. She is thinking about 4 . She thinks and thinks. Then she has an 5 . "I can buy a card 6 my dear mother." Doris goes to a supermarket and buys a beautiful card. She 7 some words on it. She shows it to her mother and says, "Here is a card for you, Mum." Her mother is 8 happy. " 9 , Doris." She says. Doris is 10 , too. | ||||
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