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【简答题】
在暴风雪天气中融雪剂能发挥重要的作用。市场上一种融雪效果   好、无污染的融雪剂的主要成分是醋酸钾(CH 3 COOK)。请回答： (1)醋酸钾中C、H、O元素的质量比为_________， (2)醋酸钾中钾元素的质量分数为___________（精确到0.1%）； (3)392 g醋酸钾中含有__________g钾元素（精确到个位）。
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参考答案：
举一反三
【单选题】关于窦房结正确的描述是
A.
内脏神经作用决定其兴奋
B.
借房室束连于房室结
C.
是心脏正常的起搏点
D.
位于房间隔下部右侧心内膜下
查看完整题目与答案
【单选题】She______ when she’s putting thread into a needle.
A.
sips
B.
frowns
C.
hems
查看完整题目与答案
【单选题】样本含量对误差影响的描述,正确的是 ()
A.
样本越大，系统误差越大
B.
样本越大，抽样误差越小
C.
样本越大，标准误越大
D.
样本越大，系统误差越小
E.
以上说法均不正确
查看完整题目与答案
【简答题】She can't tolerate noise of any sort when she’s trying to write.
查看完整题目与答案
【单选题】-What’s Laura going to do when she leaves school? -Until a few months ago, she was thinking of going to university, but she’s changed her mind. Now she believes she’s going to make it in the pop world...
A.
How do you feel about that?
B.
What’s she doing just now?
C.
What makes her change her mind?
D.
She’s doing great in the pop world.
查看完整题目与答案
【单选题】关于窦房结正确的描述是
A.
借房室束连于房室结
B.
是心脏正常的起搏点
C.
位于房间隔下部右侧心内膜下
D.
属于特殊神经组织
查看完整题目与答案
【单选题】关于窦房结正确的描述是
A.
内脏神经作用决定其兴奋
B.
借房室束连于房室结
C.
是心脏正常的起搏点
D.
位于房间隔下部右侧心内膜下
E.
属于特殊神经组织
查看完整题目与答案
【单选题】_____ I mention ______ football , she says she’s too busy .
A.
Whenever ; playing
B.
When .; playing
C.
Whenever; to play
D.
When ; to play
查看完整题目与答案
【单选题】What troubles did Laura have when she’s ready for college?
A.
She didn’t have enough money for college.
B.
She just didn’t want to go to college.
C.
She’s still confused ( 困惑 ) about her future.
D.
She wanted to work.
查看完整题目与答案
【单选题】She won’t let me _____ her when she’s busy.
A.
helping
B.
help
C.
to help
D.
helped
查看完整题目与答案
相关题目：
【单选题】关于窦房结正确的描述是
A.
内脏神经作用决定其兴奋
B.
借房室束连于房室结
C.
是心脏正常的起搏点
D.
位于房间隔下部右侧心内膜下
查看完整题目与答案
【单选题】She______ when she’s putting thread into a needle.
A.
sips
B.
frowns
C.
hems
查看完整题目与答案
【单选题】样本含量对误差影响的描述,正确的是 ()
A.
样本越大，系统误差越大
B.
样本越大，抽样误差越小
C.
样本越大，标准误越大
D.
样本越大，系统误差越小
E.
以上说法均不正确
查看完整题目与答案
【简答题】She can't tolerate noise of any sort when she’s trying to write.
查看完整题目与答案
【单选题】-What’s Laura going to do when she leaves school? -Until a few months ago, she was thinking of going to university, but she’s changed her mind. Now she believes she’s going to make it in the pop world...
A.
How do you feel about that?
B.
What’s she doing just now?
C.
What makes her change her mind?
D.
She’s doing great in the pop world.
查看完整题目与答案
【单选题】关于窦房结正确的描述是
A.
借房室束连于房室结
B.
是心脏正常的起搏点
C.
位于房间隔下部右侧心内膜下
D.
属于特殊神经组织
查看完整题目与答案
【单选题】关于窦房结正确的描述是
A.
内脏神经作用决定其兴奋
B.
借房室束连于房室结
C.
是心脏正常的起搏点
D.
位于房间隔下部右侧心内膜下
E.
属于特殊神经组织
查看完整题目与答案
【单选题】_____ I mention ______ football , she says she’s too busy .
A.
Whenever ; playing
B.
When .; playing
C.
Whenever; to play
D.
When ; to play
查看完整题目与答案
【单选题】What troubles did Laura have when she’s ready for college?
A.
She didn’t have enough money for college.
B.
She just didn’t want to go to college.
C.
She’s still confused ( 困惑 ) about her future.
D.
She wanted to work.
查看完整题目与答案
【单选题】She won’t let me _____ her when she’s busy.
A.
helping
B.
help
C.
to help
D.
helped
查看完整题目与答案
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