【单选题】在梯度液中不同沉降速度的粒子处于不同的密度梯度层内形成几条分开的样品区带,达到彼此分离的目的,这种方法是
【单选题】What kind of planet might NOT support life?
A.
Most of the planets of the stars.
B.
Stars similar to our sun.
C.
Planets similar to the earth.
D.
Planets with proper conditions.
【单选题】限制部分自由度就能满足工件加工要求,这种定位称为( )。
【单选题】下列句子使用的修辞手法,判断正确的一项是
A.
四年黑暗中的苦工,一月阳光下的享乐,这就是蝉的生活。(夸张)
B.
假使没有了头颅,却还能做服役和战争的机械,世上的情形就何等地醒目啊!(反语)
C.
比如说“神圣”,比如说“终极”,谁看得见“终极”?(设问)
D.
十九日,夜的下半夜,人衰弱到极点了。天将发白时,鲁迅先生就像他平日一样,工作完了,他休息了。(双关)
【单选题】What can be inferred from the latest survey?
A.
Hospital teaching across the country is similar.
B.
Children are better off without hospital teachers.
C.
Only one-fourth of the hospitals have full-time teachers.
D.
All hospitals surveyed offer special treatment to children.
【判断题】若圆柱体的底面为水平面,则圆柱体的三面投影是一个圆和两个大小相等的矩形。
【单选题】---Where is your grandpa? ---He _________ Canada and __________ Toronto for a month.
A.
has been to, has been in
B.
has gone to, has been in
C.
has been in, has been to
D.
has gone to, has been to
【单选题】________ is your birthday? April 8th. [ ]