下列零部件中，用于平衡发动机在冷态和热态下冷却液体积差异的是（）
A、水箱
B、喷水壶
C、副水箱
D、暖风水箱
参考答案：C
You ________ in person; a telephone would have been enough.
A．couldn't have come
B．needn't have come
C．shouldn't have come
D．mustn't have come
索膜支承结构安装包括如下工序：①节点埋件预埋;②节点预埋复核;③钢结构制作;④构件防腐、防火涂装;⑤构件吊装。下列安装流程中，正确的是()。
A.④①②③⑤
B.②①③④⑤
C.②③①⑤④
D.①③②④⑤
