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进行化学实验时必须要有规范、安全意识。下列做法错误的是(   ) A用托盘天平称量样品时，放物品，右砝码 B容量瓶在使用之前检查是否漏液 C．蒸馏装置中，冷凝水的方向是下口进水，上口出水 D在实验室中检验蔗糖、加碘食盐，可各取少量分别放在口里品尝一下
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举一反三
【单选题】2 承压型螺栓连接比摩擦型螺栓连接( )
A.
承载力低，变形大
B.
承载力高，变形大
C.
承载力低，变形小
D.
承载力高，变形小
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【单选题】选用过滤器应考虑通流能力、机械强度、( )和其它功能。
A.
过滤精度
B.
液压油品牌
C.
温升
D.
液压油闪点
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【单选题】选用过滤器应考虑( )、通流能力、机械强度和其它功能。
A.
压力
B.
过滤精度
C.
流量
D.
速度
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【单选题】I’m looking forward to ______him on the 17th.
A.
visit
B.
visiting
C.
visited
D.
visits
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【单选题】It’s bad for your health to go to school breakfast.
A.
with
B.
without
C.
for
D.
have
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【单选题】听力原文：M: My parents will visit me next Monday. I'm looking for an apartment for them these days. W: Why not go to the overseas-students housing office to check their list of currently available apartme...
A.
To go to the overseas-students' housing office for help.
B.
To check the list of the available apartment on the Internet.
C.
To see different landladies so as to find a satisfying apartment.
D.
To check out an apartment for his parents.
查看完整题目与答案
【简答题】阅读有关网上交友的帖子,勾出发帖人的两类观点。 ( )It’s good to make more friends in our real lives. ( )It’s good to make friends online. ( )It’s bad to make more friends in our real lives. ( )It’s bad to make friend...
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【单选题】It’s bad manners to call ___.
A.
other’s
B.
others names
C.
others of names
D.
someone’s names
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【单选题】Don’t watch TV . It’s bad for your health.
A.
much too        
B.
too much        
C.
too more
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【单选题】—I’m looking for a jacket for my son. —What color do you like , the blue one or the red one? [     ]
A.
the best
B.
good
C.
best
D.
better
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相关题目：
【单选题】2 承压型螺栓连接比摩擦型螺栓连接( )
A.
承载力低，变形大
B.
承载力高，变形大
C.
承载力低，变形小
D.
承载力高，变形小
查看完整题目与答案
【单选题】选用过滤器应考虑通流能力、机械强度、( )和其它功能。
A.
过滤精度
B.
液压油品牌
C.
温升
D.
液压油闪点
查看完整题目与答案
【单选题】选用过滤器应考虑( )、通流能力、机械强度和其它功能。
A.
压力
B.
过滤精度
C.
流量
D.
速度
查看完整题目与答案
【单选题】I’m looking forward to ______him on the 17th.
A.
visit
B.
visiting
C.
visited
D.
visits
查看完整题目与答案
【单选题】It’s bad for your health to go to school breakfast.
A.
with
B.
without
C.
for
D.
have
查看完整题目与答案
【单选题】听力原文：M: My parents will visit me next Monday. I'm looking for an apartment for them these days. W: Why not go to the overseas-students housing office to check their list of currently available apartme...
A.
To go to the overseas-students' housing office for help.
B.
To check the list of the available apartment on the Internet.
C.
To see different landladies so as to find a satisfying apartment.
D.
To check out an apartment for his parents.
查看完整题目与答案
【简答题】阅读有关网上交友的帖子,勾出发帖人的两类观点。 ( )It’s good to make more friends in our real lives. ( )It’s good to make friends online. ( )It’s bad to make more friends in our real lives. ( )It’s bad to make friend...
查看完整题目与答案
【单选题】It’s bad manners to call ___.
A.
other’s
B.
others names
C.
others of names
D.
someone’s names
查看完整题目与答案
【单选题】Don’t watch TV . It’s bad for your health.
A.
much too        
B.
too much        
C.
too more
查看完整题目与答案
【单选题】—I’m looking for a jacket for my son. —What color do you like , the blue one or the red one? [     ]
A.
the best
B.
good
C.
best
D.
better
查看完整题目与答案