对某边观测4测回，观测中误差为±2cm，则算术平均值的中误差为（）

Among the following words, “ ______ ” contains a negative prefix.

Which of the following words does NOT have suffixes?

普通水准测量，应在水准尺上读取()位数。

A mong the following words, “ ______ ” does NOT have inflectional affixes.

How many monomorphemic words are there in the following words? cats boss work improper tried

Modern English vocabulary develops through the following channels EXCEPT ______.

Which of the following is NOT one of the main sources of new words in the present-day English vocabulary?

The Indo-European language family is made up of the languages of the following EXCEPT ______ .

Aliens are borrowed words which have retained their original pronunciation and spelling. Which of the following words comes from Chinese?