在热水供暖系统中应在热力入口处的供、回水总管上设置()。
A. 压力表
B. 温度计
C. 压力表、温度计、除污器
D. 除污器
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会员制的期货交易所不能改制上市。()
A. 正确
B. 错误
期货交易和现货交易的对象都是实物商品。()
A. 正确
B. 错误
We learn from the text that traffic planners are more concerned about
A. the attitude of drivers in London.
B. taking a political standpoint.
C. sophisticated tolling systems.
D. imposing congestion charging.
The implementation of road pricing in London is primarily intended to
A. restrain the capital's traffic growth.
B. produce net annual municipal revenues.
C. remove on-street parking lots.
D. meet ambitious political aims.
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