It is quite（）for an SES operator to send a distress alert.

A.easy and expensive

B.simple and certain

C.dangerous and stable

D.difficult and compulsory

阳明腑实，痞、满、实而不燥者，宜选用（）

A．十枣汤

B．三物备急丸

C．大承气汤

D．小承气汤

E．调胃承气汤