单项选择题

中间宿主是指：
A、寄生有寄生虫的幼虫或无性生殖阶段的动物
B、寄生有寄生虫成虫阶段的动物
C、寄生有寄生虫的脊椎动物
D、寄生有人体寄生虫的节肢动物
E、寄生有感染阶段的动物

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单项选择题

As the zaju of northern China flourished to the next dynasty, it divided the new genre — Nanxi, literally meaning "Southern Drama and Legend".（） Opera is one of the oldest existing forms of Chinese opera, which has dominated Chinese drama from the 16th century to the 18th century. In 2001, it was listed by UNESCO as the first "oral and intangible heritage of mankind ".
A、Shaoxing opera
B、Henan opera
C、Beijing opera
D、Kunqu opera

多项选择题

扩散R□偏低，应做如下调整：（）

A.减小扩散温度
B.增大小N2流量
C.减小大N2流量
D.减小扩散时间