一台家用空调正常工作功率约为 （ ）
A．1.5瓦。
B．15瓦。
C．150瓦。
D．1500瓦。
答案：D
一台家用空调正常工作功率约为1500W，选D
—Where is Wang Fei?
—He is playing on the ground. He _______ his homework. [ ]
A. had finished
B. must have finished
C. should finish
D. must be finished
代号为L10的铁水其含硅量为（），代号为Z18的铁水其含硅量为（）。
