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【简答题】
张扬在某实验中的主要操作步骤及弹簧测力计的示数，如下图所示： （1）根据图中提供的信息，石块受到的浮力F 浮 =________N，石块排开水所受的重力G 排 =__________N。 （2）由此得出的结论是：__ __ _ _____。 （3）该石块的密度ρ 石 = __________kg/m 3
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【简答题】跨境电商存在的问题?
【判断题】在一棵度为 4 的树中,若有 20 个度为 4 的结点, 10 个度为 3 的结点, 1 个度为 2 的结点, 10 个度为 1 的结点,则树 T 的叶结点个数是 81 。
A.
正确
B.
错误
【单选题】Question 6 is based on the news report you have just heard.
A.
He has lots of fans on Facebook.
B.
He has rich experience in flying.
C.
He often suffers from toothaches.
D.
He has learned to pull teeth from a video.
【单选题】Question 6 is based on the news report you have just heard.
A.
Engineering problems.
B.
The air pollution is produced.
C.
inadequate funding.
D.
The opposition from the military.
【单选题】Question 6 is based on the news report you have just heard. 6 .
A.
Zimbabweans stayed away from voting.
B.
Zimbabweans were enthusiastic about voting.
C.
Only a f ew Z imbabweans t urn ed up to vote.
D.
Zimbabweans believed that Mugabe would win.
【单选题】在一棵度为 3 的树中,若度为 3 的结点有 2 个,度为 2 的结点有 1 个,度为 1 的结点有 2 个,则叶子结点数为 ( ) 。
A.
5
B.
6
C.
7
D.
8
【单选题】Question 6 is based on the news report you have just heard.
A.
Deliver scientific equipment to the moon.
B.
Approve a new mission to travel into outer space.
C.
Work with federal agencies on space programs.
D.
Launch a manned spacecraft to Mars.
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