【判断题】按用途分类,低压电器可分为配电电器、控制电器、保护电器、主令电器和执行电器。
【简答题】按控制作用分,低压电器可分为执行电器、( )、( )和保护电器。
【单选题】Consider the cornfield with soil that had an amino sugar N content of 350 mg/kg in Study 2. Based on Figure 2 and other information provided, was the soil in the cornfield responsive or nonresponsive?
A.
Responsive, because the yield did not increase.
B.
Responsive, because the yield increased.
C.
Nonresponsive, because the yield did not increase.
D.
Nonresponsive, because the yield increased.
【单选题】Consider the amino acid shown below. The configuration about which atom will determine whether the amino acid is in the D or L configuration?
【判断题】采集血液标本时,为减轻病人痛苦,可在静脉输液处采血。
【判断题】储液干燥器一定要垂直安装。( )A. 对 B. 、错
【单选题】Consider the amino acid shown below. The configuration about which atom will determine whether the amino acid is in the D or L configuration? 以下所示的氨基酸,哪个原子的构型将决定氨基酸是 D还是L的构型?
【单选题】中央军事委员会实行负责制是依据 () 。