对于局部热水供应系统的热源宜采用( )等。
A.蒸汽式高温水
B.太阳能及电能、燃气、蒸汽
C.能保证全年供热的热力管网
D.燃油、燃气热水机组或电蓄热设备
参考答案:B
His knowledge of French was ________ for the job, although he was not fluent in the language. [ ]
A. adequate
B. abstract
C. available
D. appropriate
普通高中化学课程共有()模块。
A.2个
B.6个
C.8个
D.4个