负荷率是指在一段时间内平均负荷与最大负荷的比率。
参考答案:对
Being able to speak another language fluently is a great _____ when you're looking for a job. [ ]
A. chance
B. success
C. effort
D. advantage
正常月经周期以28日为例,月经周期第20~23日称为()
A.增殖期晚期
B.分泌期早期
C.分泌期中期
D.分泌期晚期
E.月经中期