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【多选题】
下列属于神经干动作电位的特点是( )A.
神经干动作电位呈,向上的波和向下的波幅度一定相等
B.
神经干动作电位的幅值会在一定范围内随刺激强度的增大而增大
C.
如果将两引导电极之间的神经夹伤,观察到的为单相动作电位
D.
改变两引导电极的距离动作电位的不变
E.
以上均不对
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【单选题】—Has she got a dog? —_____. It is black and white. [ ]
A.
Yes, she is
B.
Yes, she has
C.
No, he has
D.
No, she isn't
【简答题】如图已知直线L 1 //L 2 ，直线L⊥L 2 ， ∠β=55°，则∠α=（ ）。
【简答题】A．She has a toothache. B．She coughs badly. C．She has got a cancer. D．She caught a cold.
【单选题】I’ve no idea how much work it is to be _____ a World Expo but I’m sure they’ve done a lot.
A.
in favor of
B.
in response to
C.
on behalf of
D.
in charge of
【单选题】Mother asked her daughter whether ____ everything ready for the exam. [ ]
A.
has she got
B.
she has got
C.
had she got
D.
she had got
【简答题】She ＿＿＿＿＿ to the office than she got down to writing the report. A has no sooner got B. had hardly got C .no sooner got D. had no sooner got
【单选题】She ______ to the office than she got down to writing the report. [ ]
A.
has no sooner got
B.
had hardly got
C.
no sooner got
D.
had no sooner got
【单选题】Mum is coming. What present _______ for your birthday?
A.
you think she has got
B.
you think has she got
C.
do you think she has got
D.
do you think has she got
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