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【单选题】
关于复杂系统极坐标图,说法错误的有A.
只要系统含有积分环节，极坐标图就起始于无穷远点。
B.
起始于无穷远点的极坐标图，从哪一象限开始绘制取决于转折频率最低环节的相角。
C.
极坐标图与负实轴的交点频率称为穿越频率，可以令频率特性函数的虚部为0求出。
D.
所有极坐标图都终止于原点。
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A.
has started
B.
would start
C.
started
D.
had started
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A.
I型上皮细胞、Ⅱ型上皮细胞、毛细血管内皮基膜
B.
I型上皮细胞、Ⅱ型上皮细胞、上皮基膜
C.
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D.
肺泡上皮、上皮基膜、工型上皮细胞
E.
肺泡上皮、上皮基膜、毛细血管内皮基膜
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A.
Ⅰ型上皮细胞、Ⅱ型上皮细胞、毛细血管内皮基膜
B.
Ⅰ型上皮细胞、Ⅱ型上皮细胞、上皮基膜
C.
Ⅱ型上皮细胞、上皮基膜、毛细血管内皮基膜
D.
肺泡上皮、上皮基膜、Ⅰ型上皮细胞
E.
肺泡上皮、上皮基膜、毛细血管内皮基膜
【单选题】During the Great Depression he got ______ drug after he lost his job. Thanks to his mother, he decided _____ quitting at last
A.
into; to
B.
into; against
C.
into; on
D.
for; into
【简答题】Carl lost his job. He had so little money that he spent his days at home. He watched his neighbor’s room, where an old professor lived. He found the rooms were full of old furniture and vases. Carl th...
【单选题】What's Mr. Clinton's comment on his work?
A.
He does his job enthusiastically, though he has not much efficiency.
B.
He didn't want to persist on his job from the beginning.
C.
He does his job adequately, but he doesn't do it well enough to deserve a raise.
D.
He should be dismissed anyway.
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