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【多选题】
常用的齿轮结构形式有：( )、实心式齿轮、( )、轮辐式齿轮、多练齿轮。A.
齿轮轴
B.
腹板齿轮
C.
腹板式齿轮
D.
渐开线齿轮
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【简答题】What must you do when you receive a present 56 your birthday? You have to sit down and write a thank-you note. The words “Thank you” are 57 important. We have to use them very often. We say them when ...
【单选题】海滩上常见“车螺”（学名“文蛤”）与“刺螺”两种贝壳，“车螺”外壳光滑，“刺螺”外壳有很多刺，当不小心踩到“刺螺”上时会很痛，甚至伤脚，这是因为踩“刺螺”时（ ）
A.
压力变大
B.
压力变小
C.
压强变大
D.
压强变小
【简答题】完形填空。 What must you do when you receive a present 1 your birthday? You have to sit down and write a thankyou note. The words 'Thank you' are 2 important. We have to use them very often. We say them wh...
【简答题】What must you do when you get a present for your birthday? You have to sit down and w 小题1: a thank-note. The words“thank you” are very important. We have to use them very o小题2:We say them when someone...
【单选题】流脑皮疹的特点应除外
A.
出血性皮疹,为瘀点或瘀斑
B.
皮疹分布全身皮肤及黏膜
C.
大片瘀斑中央可呈紫黑色坏死或大疤
D.
在恢复期10%患者可出现口唇疱疹
E.
瘀斑、瘀点是诊断流脑的必备体征
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