5的算术平方根是______，-8的立方根是______．
5的算术平方根是5，-8的立方根是-2．
故答案为：5；-2
The course normally attracts 20 students per year, ____ up to half will be from overseas.
A．in which
B．of whom
C．of which
D．for whom
从事生产、经营的纳税人应当自领取营业执照或者发生纳税义务之日起 ( )日内，按照国家有关规定设置账簿。
A．10
B．15
C．20
D．30
