It was in the lab_________was taken charge of by Johnson_________they did the experiment.

A．where; which

B．which; that

C．which; which

D．that; which

不属于硝酸甘油机制的是（）

A．降低室壁肌张力

B．降低心肌氧耗量

C．扩张心外膜血管

D．降低左心室舒张末压

E．降低交感神经活性