【单选题】下列药物为非选择性β受体拮抗剂的是( )
【简答题】魔棒工具的默认容差值是 __________ 。
【单选题】下列药物属于非选择性β受体拮抗剂的是( )
【简答题】使用魔棒工具做选区,容差的默认值是 ,输入的值越小,选取的颜色范围越 ,选取范围则 。
【单选题】非选择性β受体拮抗剂propranolol的化学名是( )。
A.
1-异丙胺基-3-[对-(2-甲氧基乙基)苯氧基]-2-丙醇
E.
2,2-二甲基-5-(2,5-二甲苯基氧基)戊酸
【单选题】The unloading system on an air compressor will _____.
A.
increase compressor discharge pressure on demand
B.
increase compressor operating speed as necessary
C.
allow the motor to turn the compressor opposed only by friction
D.
reduce the compressor frictional load when starting
【单选题】If the discharge valves on a refrigeration compressor are leaking badly, the compressor should _____.
C.
have high discharge pressure
D.
short cycle on the high pressure switch
【判断题】美托洛尔属于非选择性β受体拮抗剂类抗高血压药。( )