二氢叶酸合成酶的竞争性抑制剂是
A.敌百虫B.丙二酸C.磺胺类药物D.琥珀酸
参考答案:C
My cousin, little Tom, is __________ a fool. He did very well in all his subjects.
A.something as
B.something but
C.anything but
D.nothing but
划分液压油牌号的粘度采用的温度是()。
A、100℃
B、50℃
C、20℃
D、40℃