判断单向阀方向的根据是()。
A.单向阀上的箭头标记
B.工艺介质的温度
C.工艺介质的特性
D.工艺管线的规格
参考答案:A
Mary, who newly came to the class, has already earned both the trust of her classmates and _________ of her teachers.
A.one
B.ones
C.that
D.those
人的身心发展只需学校教育而无需社会实践。