【判断题】【消耗次数：1】
航天器是到空间完成特定任务的有效载荷。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【多选题】
下列关于航天器专用系统和保障系统的说法正确的是（）。
①
A.专用系统用于直接执行特定的航天任务
②
B.保障系统用于保障专用系统的正常工作
③
C.保障系统随航天器的任务而异
④
D.专用系统在一般航天器上是类似的
【单选题】
航天运载器技术是航天技术的基础，必须利用航天运载器克服地球引力和空气阻力将航天器送到外层空间一下关于运载火箭的描述，正确的是（）。
①
A.运载火箭主要由动力系统，控制系统整流罩和无线电测量系统组成
②
B.运载火箭主要由推进剂控制系统箭体结构和无线电测量系统组成
③
C.运载火箭主要由动力系统，控制系统，箭体结构和无线电测量系统组成
④
D.运载火箭主要由动力系统，制导系统。箭体结构和无线电测量系统组成
随机题目
【单选题】
Here is some ____ advice to any young businessman.
①
variable
②
worthwhile
③
worthy
④
value
【单选题】
You must have stayed up late last night, _____?
①
mustn’ t you
②
don’ t you
③
didn’ t you
④
needn’ t you
【单选题】
Mr. Milton prefers to resign ____ part in such dishonest business deals.
①
than take
②
than to take
③
rather than take
④
rather than to take
【单选题】
If your new coat is too large, a tailor can____ it to fit you.
①
alter
②
transform
③
vary
④
change
【单选题】
Many automobile accidents were ____ careless driving.
①
attributed to
②
resulted in
③
contributed to
④
raised from
【单选题】
To obtain a satisfactory result, one must apply
two ____ of paint on a clean surface.
①
coats
②
levels
③
times
④
courses
【单选题】
No one would have time to read or listen to an account of everything ____going on in the world.
①
it is
②
as is
③
there is
④
what is
【单选题】
They have done things they ought_____.
①
not to do
②
not to be done
③
not to have done
④
not having done
【单选题】
____ native to North America, corn has now spread all over the world.
①
In spite of
②
That it is
③
It was
④
Although