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【单选题】
飞机的纵向稳定性主要取决于飞机重心的位置,只有当飞机的重心位于焦点___时,飞机纵向稳定。A.
中间
B.
后面
C.
前面
D.
上面
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反馈参考答案：
举一反三
【简答题】将下列命题符号化，并指出各命题的真值．
【简答题】在一阶逻辑中将下列命题符号化，并指出各命题的真值，个体域分别为：(a)自然数集合N(N中含0)；(b)整数集合Z；(c)实数集合R．
【单选题】-Yu Ting, are you _____ for the long jump? It's time to begin. -Yes, let's go. [ ]
A.
good
B.
stand
C.
ready
D.
doing
【单选题】听力原文：M: I think it's starting to snow. W: Starting to snow? Look,' the grounds are al ready white. Q: What does the woman mean? (13)
A.
It has just begun snowing.
B.
She doesn't like snowy days.
C.
It has been snowing for some time.
D.
She doesn't think it's going to snow.
参考解析：
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