矿井提升系统按用途可分为主井提升系统和副井提升系统。
参考答案:对
套期保值是以规避现货风险为目的的期货交易行为。 ( )
Standing on the top of the Oriental Pearl TV Tower, ______ a good bird’s–eye view of Shanghai city.
A.it will be
B.you will get
C.there will be
D.it will have