皮皮学，免费搜题
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【多选题】
平滑肌纤维不同于心肌纤维的是A.
有密斑和密体
B.
无闰盘
C.
有中间丝
D.
无横小管
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
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【简答题】光纤接入方式可以___以上的速率接入互联网。典型的无线接入系统主要由___、___、___、___和___组成。
【单选题】Why was the black box redesigned in 1965?
A.
New materials became available by that time.
B.
Too much space was needed for its installation.
C.
The early models often got damaged in the crash.
D.
The early models didn't provide the needed data.
【单选题】The American Visitor The big red American ear was much too wide for an English country road. When Paul Carson saw it coming towards him, he stopped his own car at the side, to make room for it to pass...
A.
Y
B.
N
C.
NG
【单选题】As a result of the Black Death, much land was left untended and there was a terrible shortage of _______ in England.
A.
grain
B.
farm tools
C.
houses
D.
labour
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