皮皮学,免费搜题
登录
搜题
【简答题】
在化学反应中,加入催化剂可以加快反应速率,主要是因为 (升高或降低)了反应活化能,活化分子百分数 (增加或减小),速率常数 k (增大或减小)。
拍照语音搜题,微信中搜索
"皮皮学"
使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【单选题】—Is Alice still performing? —I'm afraid not. She is said _______ the stage already as she has become a director.
A.
to have left
B.
to leave
C.
to have been left
D.
to be left
查看完整题目与答案
【单选题】I'm sorry to have you waiting so long for Marcia, and I'm afraid it'll be ten minutes _______ she comes back. [ ]
A.
before
B.
after
C.
until
查看完整题目与答案
【单选题】— Could I speak to Miss Smith, please? — ______. She's gone to the post office. [ ]
A.
I'm afraid not
B.
I think so
C.
Certainly you can
D.
I'm not sure
查看完整题目与答案
【单选题】—How anxious Ruby is! I wonder what on earth she ________. —I’m afraid nobody knows. She is always so strange.
A.
has expected
B.
will expect
C.
will have expected
D.
is expecting
查看完整题目与答案
【单选题】— Is Alice still performing? — I’m afraid not. She is said the stage already as she has gone ab
A.
— Is Alice still performing? — I’m afraid not. She is said ____ the stage already as she has gone abroad for further study. A.to leave
B.
to have left
C.
to be left
D.
to have been left
查看完整题目与答案
【单选题】— I'm afraid I have to leave a little earlier. My mother is ill in bed. — ____ I hope she will be all right soon. [ ]
A.
It's nothing.
B.
Nothing.
C.
I'm sorry to hear that.
D.
So she is.
查看完整题目与答案
【单选题】----- Why hasn’t she come to the party? ----- I’m afraid she can’t. She is _______ in preparing her graduation paper.
A.
covered
B.
filled
C.
occupied
D.
crowded
查看完整题目与答案
【判断题】细小孔隙内的毛细水既受重力作用,也受表面张力(或毛细力)作用。
A.
正确
B.
错误
查看完整题目与答案
【简答题】细小孔隙内的毛细水既受重力作用,也受表面张力即( )作用。
查看完整题目与答案
【单选题】--Will Betty join the talent show on Friday? --I’m afraid she won’t. she is too to act in front of other people.
A.
shy
B.
confident
C.
pleased
查看完整题目与答案
相关题目:
【单选题】—Is Alice still performing? —I'm afraid not. She is said _______ the stage already as she has become a director.
A.
to have left
B.
to leave
C.
to have been left
D.
to be left
查看完整题目与答案
【单选题】I'm sorry to have you waiting so long for Marcia, and I'm afraid it'll be ten minutes _______ she comes back. [ ]
A.
before
B.
after
C.
until
查看完整题目与答案
【单选题】— Could I speak to Miss Smith, please? — ______. She's gone to the post office. [ ]
A.
I'm afraid not
B.
I think so
C.
Certainly you can
D.
I'm not sure
查看完整题目与答案
【单选题】—How anxious Ruby is! I wonder what on earth she ________. —I’m afraid nobody knows. She is always so strange.
A.
has expected
B.
will expect
C.
will have expected
D.
is expecting
查看完整题目与答案
【单选题】— Is Alice still performing? — I’m afraid not. She is said the stage already as she has gone ab
A.
— Is Alice still performing? — I’m afraid not. She is said ____ the stage already as she has gone abroad for further study. A.to leave
B.
to have left
C.
to be left
D.
to have been left
查看完整题目与答案
【单选题】— I'm afraid I have to leave a little earlier. My mother is ill in bed. — ____ I hope she will be all right soon. [ ]
A.
It's nothing.
B.
Nothing.
C.
I'm sorry to hear that.
D.
So she is.
查看完整题目与答案
【单选题】----- Why hasn’t she come to the party? ----- I’m afraid she can’t. She is _______ in preparing her graduation paper.
A.
covered
B.
filled
C.
occupied
D.
crowded
查看完整题目与答案
【判断题】细小孔隙内的毛细水既受重力作用,也受表面张力(或毛细力)作用。
A.
正确
B.
错误
查看完整题目与答案
【简答题】细小孔隙内的毛细水既受重力作用,也受表面张力即( )作用。
查看完整题目与答案
【单选题】--Will Betty join the talent show on Friday? --I’m afraid she won’t. she is too to act in front of other people.
A.
shy
B.
confident
C.
pleased
查看完整题目与答案