【单选题】Some fruits are so easily harvested in this area that they are never of great _____
【单选题】______ sunshine and rainfall ______ a good harvest of fruits and begetables this year.
A.
A large quantity of ; promise
B.
A large number of; promise http:/
C.
A large quantity of; promises
D.
Large quantities of; promises
【单选题】关于三相半波可控整流电路,大电感负载,以下面描述错误的是?
B.
变压器二次侧电流平均值为负载电流平均值的1/3
D.
负载电压平均值表达式为Ud=1.17U2cosα
【单选题】病人,女性,36岁,患有支气管哮喘5年。每次吸入花露水香味就会诱发哮喘发作,因此建议病人在每次哮喘发作时首选
【单选题】1933年,《东方杂志》面向全社会征集了新年梦想,()持以悲观态度。
【单选题】Eating more fruits and vegetables is good _________ our health.