仰拱施工应配备有足够的强度、刚度和稳定性的栈桥等架空设施。仰拱施工栈桥基础应稳固，桥

将H₂(g)和Br₂(g)充入恒容密闭容器，恒温下发生反应H₂(g)＋Br₂(g)2HBr(g)　ΔH<0，平衡时Br₂(g)的转化率为a；若初始条件相同，绝热下进行上述反应，平衡时Br₂(g)的转化率为b。a与b的关系是 [ ]

A．a>b

B．a＝b

C．a<b

D．无法确定

在三国和两晋时期，出现了( )3次著名的以少胜多的战役。

A．官渡之战

B．火烧连营

C．淝水之战

D．赤壁之战

E．长坂坡之战

But for the help of my English teacher, I ____  the first prize in the English Writing Competition. 

A．would not win

B．would not have won

C．would win

D．would have won

用括号内所给动词的适当形式填空。

小题1:Daniel told me that he__________ (take) care of my pet for me in the next few days..

小题2:Britain was the first country in the world__________ (have) a free health system.

小题3:Boats float in the direction of wind if they__________ (not control).

小题4:You can show your support to our school football team by_________ (cheer) for our players.

小题5:When I came into the house, my daughter__________ (sweep) the floor clean.

小题6:It’s said the prices for house sale _________ (fall) a lot in the past ten months.

小题7:Cold viruses can also__________ (spread) by objects, such as telephones, plates and keyboards.

小题8:Our Maths teacher__________ (prepare) the new lesson with other teachers in the office from 2 to 4 yesterday afternoon.

对舞台演员基本要求是（），对电影演员的基本要求是（）。

A.肢体语言夸张

B.让观众看得见听得到

C.表情丰富

D.服装抢眼