根据我国《海船船员发证规则》规定,适任证书持有人应当在适任证书适用范围内担任职务或者担任()适任证书适用范围的职务。
A.高于
B.低于
C.以上都不正确
参考答案:B
What he had said about the incident and done with it _________ our trouble.
A.added up to
B.added to
C.added up
D.were added to
灌溉对土壤理化性质的影响表现在几个方面?