临床初步诊断

A．急性胃炎
B．消化性溃疡
C．急性胆囊炎
D．急性胰腺炎
E．冠心病心绞痛

For ships equipped with an SES, it is（）and（）for the operator to send a distress alert.

A.easy/reliable

B.difficult/cheap

C.stable/compulsory

D.easy/expensive