A client with myocardial infarction and cardiogenic shock is placed in an intra-aortic balloon pump (IABP). If the device is functioning properly, the balloon inflates when the（）

A. triseupid valve is closed.

B. pulmonic valve is open.

C. aortic valve is closed.

D. mitral valve is closed.

原发性视网膜脱离的部位是（）

A.视网膜色素上皮层与视网膜感觉层之间

B.视网膜与脉络膜之间

C.视网膜色素上皮层与玻璃体之间

D.视网膜与巩膜之间

E.以上都不对