截止阀按液体流向有直通式、直流式和()。
A、直角式
B、四角式
C、平行四边形式
D、对角式
参考答案:A
生产劳动因素在草地形成中的作用是如何体现的?
__________many foreigners like Beijing Hongtong is __________ they are offered an atmosphere of Chinese culture there.
A.Why;because
B.That;that
C.Because;that
D.That; because