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【单选题】
液压马达重载时使用轻载挡，下列现象中：Ⅰ.爬行现象、Ⅱ.工作压力过低、Ⅲ.安全阀开启、Ⅳ.转速过快，可能出现的是________。A.
Ⅰ、Ⅱ
B.
Ⅰ、Ⅲ
C.
Ⅱ、Ⅳ
D.
Ⅲ
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皮皮学刷刷变学霸
举一反三
【单选题】如图为元素X的某粒子的结构示意图，下列说法正确的是（ ）
A.
该粒子可用符号“Mg +2” 表示
B.
该粒子不带电
C.
X元素的核电荷数为10
D.
X与Cl形成的化合物为XCl 2
【简答题】（14分）根据下列装置图回答问题(装置图用符号表示)： (1)双氧水(H 2 O 2 )是无色液体，可发生如下化学反应： 。反应中MnO 2 的作用是________。在实验室利用此反应制取氧气时，应选用的气体发生装置是________，简述检查本装置气密性的方法：______________________________________________。 (2)KClO 3 在MnO 2 作催...
【单选题】America The Beautiful,is a song almost every American can sing. And while it's true that The Star Spangled Banner has been America's official national anthem since 1931 ,many Americans feel a unique a...
A.
The Star Spangled Banner.
B.
America the Beautiful.
C.
America, America, God mend thy every flaw.
D.
God Bless America.
【简答题】阅读理解 Almost every body in America will spend a part of his or her life behind a shopping cart (购物手车) . They will , in a lifetime , push the chrome-plated contraptions many miles. But few will know-...
【简答题】阅读理解 Almost every family in America or England buys at least one copy of a newspaper every day. Some people buy as many as two or three different papers. Why do people read newspapers? Newspapers supp...
【简答题】阅读理解。 Almost every family in America or England buys at least one copy of a newspaper each day.Some people buy as many as two or three different papers. Why do people read newspapers? Newspapers suppl...
【简答题】In America, almost(几乎)every book shop sells(出售)books about food and cooking. Most(大部分)newspapers and magazines talk about Americans' eating habits.(饮食习惯)．Many books write about where to eat. So we can...
【简答题】云南白族的“( )”分别是 一苦、二甜、三回味 。
【简答题】阅读理解. In almost every big university in the United States, football is a favorite sport. American football is not like soccer. Players sometimes kick(踢) the ball, but they also throw(扔) the ball and r...
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