硝酸甘油抗心绞痛的主要机制是
A.选择性扩张冠脉,增加心肌供血
B.阻断β受体,降低心肌耗氧量
C.减慢心率、降低心肌耗氧量
D.扩张动脉和静脉,降低耗氧量;扩张冠状动脉和侧支血管,改善局部缺血
E.抑制心肌收缩力,降低心肌耗氧量
第1题
She had her finger ______when she was paper cutting.
A.cut
B.cutting
C.to cut
D.cuts
第2题
A.misplaced
B.abandoned
C.disordered
D.damaged
第4题
From its experience, the dog found that ______.
A.only the paper with Mrs. Smith's words on it could bring it meat
B.the butcher would give the meat to it whenever he saw it
C.a piece of paper could bring it half a pound of meat
D.Mrs. Smith would pay for the meat it got from the butcher
第7题
A、grabbed
B、snatched
C、gripped
D、grasped
第8题
From its experience, the dog found that ______.
A.only the paper with Mrs. Smith's words on it could bring it meat
B.the butcher would give the meat to it whenever he saw it
C.a piece of paper could bring it half a pound of meat
D.Mrs. Smith would pay for the meat it got from the butcher
第9题
A.piece, paper
B.pieces, paper
C.pieces, papers
D.piece, papers
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