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【单选题】
下列,密度最大的是A.
Os
B.
Ir
C.
W
D.
Cs
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【简答题】植物生长发育过程中需要的大量元素有C、H、O、N、P、K、Ca、Mg、S9种，被称为植物营养三要素的是哪三种元素？这三种元素对植物的生长发育分别有什么作用？施用过多或者过少，会出现什么症状？
【单选题】Companies move heaven and earth to recruit and promote the best talent because .
A.
they read the book named “The War for Talent”
B.
companies want to know how to define “talent”
C.
they can’t get enough of it
D.
stocking up on talent seems to protect companies from getting it spectacularly
【多选题】( 多选 ) 如图甲所示 , 一矩形闭合线圈在匀强磁场中绕垂直于磁场方向的转轴 OO' 以恒定的角速度 ω 转动。当从线圈平面与磁场方向平行时开始计时 , 线圈中产生的交变电流 i 随时间 t 变化的关系如图乙所示 , 则在 t= / 2 时刻 ( ) 。
A.
. 线圈中的电流最大
B.
穿过线圈的磁通量为零
C.
线圈所受的安培力为零
D.
线圈中的电流为零
【单选题】Companies move heaven and earth to recruit and promote the best talent because ______.
A.
they read the book named "The War for Talent"
B.
companies want to know how to define "talent"
C.
they can't get enough of it
D.
stocking up on talent seems to protect companies from getting it spectacularly wrong
【单选题】The explanation for " to move heaven and earth to do something" is
A.
to understand the nature of one's work and be competent in the performance of them"
B.
to lose the opportunity to do something
C.
to do something without proper material
D.
to make every effort to achieve or obtain something
【简答题】The government will move heaven and earth to solve environmental problems.
相关题目：
【简答题】植物生长发育过程中需要的大量元素有C、H、O、N、P、K、Ca、Mg、S9种，被称为植物营养三要素的是哪三种元素？这三种元素对植物的生长发育分别有什么作用？施用过多或者过少，会出现什么症状？