偏倚按其来源大致归纳为三类,即选择性偏倚、()偏倚和混杂偏倚。

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问题:

偏倚按其来源大致归纳为三类,即选择性偏倚、()偏倚和混杂偏倚。

考点:卫生人才评价考试流行病学流行病学题库
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内毒素为革兰阳性菌的细胞壁成分,细菌死亡裂解时释放出来。()

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《素问•标本病传论》指出,“病有标本,刺有逆从”的方法有()

A.有其在标而求之于标

B.有其在本而求之于本

C.有其在本而求之于标

D.有其在标而求之于本

E.标本并治

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( )是指新建房屋申请人,或原有但未进行过登记的房屋申请人,原始取得所有权而进行的登记。

A.总登记

B.转移登记

C.初始登记

D.变更登记

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车床电动机的功率为7.2kW,满载运行8h要消耗多少电能?

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"It’s no use, Mum," said Johnny. "I’m just no good at dancing."

"You’ve got to keep trying. Tonight will be (1) , dear. Try a turn with that pretty Lisette. "

Johnny (2) . Every Saturday night used to be the best of the week. He and his parents went to the (3) at the Club, where his hero, Alcide, played the accordion with the band. But lately everything had changed. Now that Johnny was older, he was (4) to dance with a girl!

(5) Johnny and his parents arrived at the Club, music had already started. Johnny got up his (6) to approach Lisette. "May I have this dance" Johnny asked. "That’s all right."said Lisette. Johnny struggled to keep up with Lisette’s (7) steps, but he was always one beat behind her. Then Johnny heard his friend Pierre say, "Look! Johnny has two left feet!" (8) burst from the crowd. Johnny (9) and ran outside, determined never to go to another dance.

The next Saturday, Alcide (10) to Johnny’s house for some potatoes. He happened to hear Johnny playing the accordion. Alcide’s eyes (11) . "Bring that accordion and play some songs tonight," Alcide said. Then he drove off, leaving Johnny staring open mouthed (12) him.

At the Club, Johnny scanned the crowd for Lisette and (13) her. The band played for a long time before Alcide said, "Dear friends, I got a (14) for you tonight. Young Johnny is going to join us!" (15) , Johnny stepped up on the platform, his eyes on the floor. He began to play, and the band (16) behind him. When the song ended, he heard cheers. Johnny kept playing until the dance was (17) . "You did a fine job tonight. Play with us again next Saturday night, " Alcide said. "Yes, sir! " said Johnny. (18) he went outside, Johnny saw Lisette and her friends near the door. Lisette stepped (19) , smiling. "You played really good tonight!" she said."Thank you," Johnny blushed. As he walked on, Pierre (20) moved out of the way for him to pass.Johnny patted his accordion. Come to think of it, in his whole life, he had never once seen Alcide out on the dance floor.

13().

A.caught

B.searched

C.sought

D.spotted

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