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【多选题】
如图所示，一木块放在水平桌面上，在水平方向上共受到三个F 1 、F 2 和摩擦力作用，木块处于静止状态，其中F 1 =10N，F 2 =4N．若撤去力F 1 ，则下列说法正确的是（）A.
木块受到的摩擦力为6N
B.
木块受到的摩擦力为4N
C.
木块所受合力为零
D.
木块所受合力为10N，方向向左
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【简答题】现代文明的发展要靠 三大支柱。
【判断题】If we include poles and zeros at infinity, the number of open-loop poles is equal to that of open-loop zeros. Hence, we can always state that the root loci start at the poles of G(s)H(s) and end at th...
A.
正确
B.
错误
【简答题】If a word end s in a consonant and another word begin s with a vowel and the two words are in the word group, we can link the two sounds together.
【单选题】What else can we learn about the current population problem in Australia from the passage?
A.
It does not trouble women in their 20s.
B.
It'll not end until people hit their 80s.
C.
It begins when Australians are 34 years old.
D.
It'll become worse and worse as men get older.
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