【简答题】如果一个酶对 A 、 B 、 C 三种底物的米氏常数分别为 K m a 、 K m b 和 K m c ,且 K m a>K m b>K m c ,则此酶的最适底物是 。
【单选题】下列对胸壁结核临床表现的描述中,错误的是()
【单选题】关于性状的原始性和进化性,下列说法错误的是( )。
B.
全缘叶是较原始性状,叶缘有起伏、锯齿等是较进化性状
【简答题】按照国家标准主电路在( )的出线端按相序依次编号为U11、V11、W11。然后按从上至下、从左至右的顺序,每经过一个电器元件后,编号要( ),如U12、V12、W12、U13、V13、W13......。
【单选题】Which of the following is the most correct statement about price controls?
A.
Price controls always help those they are designed to help.
B.
Price controls never help those they are designed to help.
C.
Price controls often hurt those they are designed to help.
D.
Price controls always hurt those they are designed to help.
【单选题】船舶处于静止正浮,当静横倾力矩大于船舶最大静稳性力矩时 。