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【单选题】
嫦娥一号担负的任务包括4项科学任务：其中有一探测月球土壤厚度以及氦-3的储量；地球上氦元素主要以 4 He形式存在，月球上氦元素主要以 3 He形式存在，已知一个 12 C原子的质量为a g，一个 3 He 原子的质量为b g，一个 4 He 原子的质量为c g ；现有： ① 3 He、 4 He的化学性质基本相同，      ② 3 He、 4 He具有相同的中子数 ③ 3 He的相对原子质量约为： 6.02ⅹ10 23 b，氦元素的相对原子质量为： ④ 3 He、 4 He为氦元素的同位素，同温同压下，密度之比为：b：c 其中正确的是
A.
①②
B.
①④
C.
②③
D.
③④
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参考答案：
举一反三
【单选题】Integrity Meds gets $1 per prescription from Carepharm, which can cover all the costs except ______.
A.
wages
B.
electricity fees
C.
machine maintenance charges
D.
project costs
查看完整题目与答案
【单选题】主治阳阴气分热盛证的代表方是( )
A.
大承气汤
B.
清营汤
C.
白虎汤
D.
黄连解毒汤
查看完整题目与答案
【单选题】Which of the following senices is excluded from Inmarsat-F services?
A.
4.8 kbps AMBE telephone.
B.
High speed
C.
Telex.
D.
E-mail.。
查看完整题目与答案
【单选题】Which of the following is the hotel employees NOT expected to do when calling a guest?
A.
Making a call with greeting.
B.
Introducing themselves.
C.
Talking in a rude manner.
D.
Giving the reasons for calling guests.
查看完整题目与答案
【单选题】Which of the following is true regarding international businesses?
A.
All MNEs are international businesses.
B.
Only firms that export products are international businesses.
C.
Only firms that invest abroad are international businesses.
D.
All international businesses are MNEs.
查看完整题目与答案
【单选题】57 Which of the following are types of status reports?
A.
document, variance, trend and exception
B.
cost, trend, schedule and acquisition
C.
cost, schedule, technical performance
D.
analysis, cost, performance and schedule
E.
All of the above.
查看完整题目与答案
【单选题】his financial problems , his wife also left him , which made him very depressed .
A.
In case of
B.
Except
C.
On top of
D.
On account of
查看完整题目与答案
【判断题】因为K2CrO4指示剂在酸性溶液中不稳定,所以铬酸钾指示剂法必须在强碱性溶液中测定Cl-的含量。
A.
正确
B.
错误
查看完整题目与答案
【简答题】莫尔法中铬酸钾指示剂的作用原理是什么? K 2 CrO 4 指示剂的用量过多或过少对滴定有何影响?
查看完整题目与答案
【单选题】主治阳阴气分热盛证的代表方是
A.
大承气汤
B.
清营汤
C.
白虎汤
D.
大青龙汤
E.
黄连解毒汤
查看完整题目与答案
相关题目：
【单选题】Integrity Meds gets $1 per prescription from Carepharm, which can cover all the costs except ______.
A.
wages
B.
electricity fees
C.
machine maintenance charges
D.
project costs
查看完整题目与答案
【单选题】主治阳阴气分热盛证的代表方是( )
A.
大承气汤
B.
清营汤
C.
白虎汤
D.
黄连解毒汤
查看完整题目与答案
【单选题】Which of the following senices is excluded from Inmarsat-F services?
A.
4.8 kbps AMBE telephone.
B.
High speed
C.
Telex.
D.
E-mail.。
查看完整题目与答案
【单选题】Which of the following is the hotel employees NOT expected to do when calling a guest?
A.
Making a call with greeting.
B.
Introducing themselves.
C.
Talking in a rude manner.
D.
Giving the reasons for calling guests.
查看完整题目与答案
【单选题】Which of the following is true regarding international businesses?
A.
All MNEs are international businesses.
B.
Only firms that export products are international businesses.
C.
Only firms that invest abroad are international businesses.
D.
All international businesses are MNEs.
查看完整题目与答案
【单选题】57 Which of the following are types of status reports?
A.
document, variance, trend and exception
B.
cost, trend, schedule and acquisition
C.
cost, schedule, technical performance
D.
analysis, cost, performance and schedule
E.
All of the above.
查看完整题目与答案
【单选题】his financial problems , his wife also left him , which made him very depressed .
A.
In case of
B.
Except
C.
On top of
D.
On account of
查看完整题目与答案
【判断题】因为K2CrO4指示剂在酸性溶液中不稳定,所以铬酸钾指示剂法必须在强碱性溶液中测定Cl-的含量。
A.
正确
B.
错误
查看完整题目与答案
【简答题】莫尔法中铬酸钾指示剂的作用原理是什么? K 2 CrO 4 指示剂的用量过多或过少对滴定有何影响?
查看完整题目与答案
【单选题】主治阳阴气分热盛证的代表方是
A.
大承气汤
B.
清营汤
C.
白虎汤
D.
大青龙汤
E.
黄连解毒汤
查看完整题目与答案
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