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【单选题】
Even a child knows that nodding head means 'Yes'. But some people Would probably (56 ) when they first came to India. When they talked to (57 ) Indian, he would often shake his head. They (58) think that the India did not like (59) they said, but on the contrary, he was expressing (60) The Indians (61) a habit of shaking their (62) slightly when they talk to (63) It doesn't mean 'No', but' (64) '. If a person doesn't (65) , it might cause misunderstandings. At one time, a foreign diplomat (外交官) (66) told his driver who was an Indian (67) him to his office. The driver (68) his head. The young diplomat repeated his (69) and the river shook his (70) again. At last, the (71) shouted angrily, 'Drive me (72) my office at once!' (73) driver also in a quite loud (74) , 'Yes, sir. ' smiling and (75) his head at the same time. (71)A.
puzzled
B.
be puzzled
C.
puzzle
D.
be puzzling
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【简答题】造成硅酸盐水泥腐蚀的基本内因是______和______；水泥腐蚀的类型主要有______、______、______、______；防止水泥石腐蚀的措施有______、______及______等。
【简答题】水泥石腐蚀的类型主要有 、 、 、 。
【多选题】引起水泥石腐蚀的内因表述准确的是( )。
A.
水泥结构本身存在毛细孔
B.
水化产物中存在Ca(OH) 2 、水化铝酸三钙
C.
腐蚀的类型主要有软水服饰、盐类腐蚀、酸类腐蚀、碱类腐蚀
D.
防止腐蚀的措施有合理选用水泥品种、提高密实度、加做保护层
【单选题】图示对称结构EI=常数,中点截面C及AB杆内力应满足( )
A.
M≠0，Q＝0，N＝0，N AB ≠0
B.
M＝0，Q≠0，N＝0，N AB ≠0
C.
M＝0，Q≠0，N＝0，N AB ＝0
D.
M≠0，Q＝0，N＝0，N AB ＝0
【单选题】图示对称结构EI=常数，中点截面C及AB杆内力应满足【图片】
A.
M ≠ 0 ， Q = 0 ， N ≠ 0 ， N AB ≠ 0
B.
M = 0 ， Q ≠ 0 ， N = 0 ， N AB ≠ 0
C.
M = 0 ， Q ≠ 0 ， N = 0 ， N AB = 0
D.
M ≠ 0 ， Q ≠ 0 ， N = 0 ， N AB = 0
【单选题】图示对称结构 EI= 常数,中点截面 C 及 AB 杆内力应满足:( )
A.
M 不等于 0 ， F Q =0 ， F N =0 ， F NAB 不等于 0
B.
M ＝ 0 ， F Q 不等于 0 ， F N =0 ， F NAB 不等于 0
C.
M ＝ 0 ， F Q 不等于 0 ， F N =0 ， F NAB ＝ 0
D.
M 不等于 0 ， F Q =0 ， F N =0 ， F NAB ＝ 0
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