下面哪个频段属于TD系统中的F频段（） A.2010－2025MHz B.2320－_爱下问搜题

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问题单项选择题

下面哪个频段属于TD系统中的F频段（）

A.2010－2025MHz

B.2320－2370MHz

C.1805－1825MHz

D.1880－1900MHz

答案

参考答案：D

选择题

--I'm told that John had another car accident this morning.

--I believe not. He ________so careless.

A．shouldn't have been

B．wouldn't have been

C．couldn't have been

D．mustn't have been

单项选择题

胎儿期是指()

A．从受精开始到满37周

B．从精子和卵子结合，受精卵形成到胎儿出生为止

C．从受精开始到满40周

D．从末次月经开始到满40周

E．从末次月经开始到小儿出生