皮皮学，免费搜题
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【单选题】
治疗指数最大的药物是（）A.
A药半数致死量（LD 50 ）=500mg，半数有效量（ED 50 ）=100mg
B.
B药LD 50 =100mg，ED 50 =50mg
C.
C药LD 50 =50mg，ED 50 =5mg
D.
D药LD 50 =500mg，ED 50 =25mg
E.
E药LD 50 =100mg，ED 50 =50mg
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反馈参考答案：
举一反三
【简答题】浓水反渗透浓水补水至三循，三循（ ）及碱度增加。
【单选题】The teacher knows that you are always the first ________ to the classroom since last September.
A.
coming
B.
to come
C.
came
D.
has come
【简答题】将浓水反渗透浓水引至三循作为（ ），作用是为了（ ）。
【单选题】Which floor is the meeting room?
A.
On the fifth floor.
B.
On the sixth floor.
C.
On the fourth floor.
【单选题】Which floor does Linda live on?
A.
The fourth floor.
B.
The fifth floor.
C.
The sixteenth floor.
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