【单选题】【消耗次数：1】
Their happiness was very ____.
①
crisp
②
brittle
③
delicate
④
fragile
参考答案：
复制
纠错
相关题目
【单选题】
Happiness doesn’t necessarily ______ money.
①
go for
②
go through
③
go back
④
go with
【单选题】
Good friends means sharing happiness but also sadness ____each other .
①
of
②
with
③
by
④
for
【单选题】
She often says her greatest happiness ____ serving the handicapped children.
①
relies on
②
consists in
③
composes of
④
comprises in
【单选题】
She often says her greatest happiness _____serving the handicapped children.
①
relies on
②
consists in
③
composes of
④
comprises in
【单选题】
Susan is not very intelligent, ________ work very hard.
①
not does she
②
neither does she
③
or does she
④
either does she
【判断题】
请判断下句是否语法正确。Seeing under a microscope, a fresh snowflake has a delicate six-pointed shape.
①
正确
②
错误
随机题目
【单选题】
关于PI控制器作用，下列观点正确的有（）
①
可使系统开环传函的型别提高，消除或减小稳态误差；
②
积分部分主要是用来改善系统动态性能的；
③
比例系数无论正负、大小如何变化，都不会影响系统稳定性；
④
只要应用PI控制规律，系统的稳态误差就为零。