具C17-α-醇酮基的甾体激素,可用氯化三苯基四氮唑显色,指出可能干扰该反应的物质
A.酸性物质B.碱性物质C.氧化性物质,还原性物质D.两性物质E.化学惰性物质
参考答案:C
The cakes which the restaurant served were delicious. The customer would like _____ third one because _____ second is rather too small.
A.a; a
B.the; the
C.a; the
D.the; a
密接式车钩缓冲装置按结构分由以下哪些部分组成:()
A、密接式车钩;
B、缓冲器;
C、电器连接器;
D、风管连接器;
E、解钩系统。