带断相保护的热继电器有（）
A、三个热元件
B、两个热元件
C、一个热元件
参考答案：A
整铸支架可摘局部义齿金属基托的厚度约为（）
A.0.5mm
B.2.0mm
C.2.5mm
D.1.5mm
E.3.0mm
—There _______ a football match this evening.
—Exciting news.
A．are going to be
B．is going to be
C．is going to have
D．will have
