用于脘腹及四肢挛急作痛，下列哪些药常相须为用（）

A.饴糖

B.甘草

C.大枣

D.蜂蜜

E.白芍

The ARQ mode should be applied（）.

A.when two stations communicate with each other

B.in any radio system and at any time

C.when one ship sends a message to another station

D.for communication among some stations