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【多选题】
下列叙述中正确的是A.
人站立时对抗重力的肌肉收缩是等长收缩
B.
等张收缩可使物体产生位移，所以做功
C.
复合收缩时引起收缩的动作电位仍是独立存在的
D.
收缩所能产生的最大张力可达单收缩的4倍左右
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反馈参考答案：
举一反三
【单选题】— Will Mr. Black be here soon? — I’m not sure. Let’s go and see .
A.
when will the train arrive
B.
when the train will arrive
C.
when the train will arrive at
D.
when will the train arrive at
【单选题】Let’s go and see the flower show ____you finish your homework.
A.
while
B.
as soon as
C.
until
【单选题】—I heard Tom was badly injured in the football match. — , let’s go and see him.
A.
If ever
B.
If so
C.
If not
D.
If any
【单选题】-Listen! Who______ in the room? -Let’s go and see.
A.
is crying
B.
crying
C.
cry
D.
cries
【单选题】— I hear Peterson was badly injured in the accident. — , let’s go and see him.
A.
What’s more
B.
If so
C.
If possible
D.
When necessary
【单选题】---- Tim was seriously hurt in the match and sent to hospital. ---- _____, let’s go and see him.
A.
If so
B.
If not
C.
If necessary
D.
If any
【单选题】— I hear Johnson was badly injured in the accident. — ____, let’s go and see him.
A.
What’s more
B.
If so
C.
Where possible
D.
When necessary
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