【单选题】Which of the following about solar power is NOT true?
A.
It is cost inefficient.
B.
It needs high technology.
C.
Solar energy even cannot compete with wind.
D.
Today's high oil prices make solar power commercially feasibl
【单选题】The airport had to close owing to being ______ less than 1,000 feet this morning.
【单选题】在逆流吸收的填料塔中,吸收操作线总是位于平衡线的( )。
【单选题】治疗高热便秘,常与大黄相须为用的药物是()