隐睾
参考答案:
睾丸于1岁末降到阴囊内称之。
________students are playing on the playground. ______students there is at least over 100.
A.A number of; A number of
B.The number of; The number of
C.A number of; The number of
D.The number of; A number of
移动式脚手架,一般可采用金属、木料装配而成,架下装有()。移动式脚手架必须经过()和验收。