电动阀执行机构中只有电动机。
参考答案:错
解析:电动阀执行机构中有电动机和传动机构。
His first novel ________ good reviews since it came out last month.[ ]
A. receives
B. is receiving
C. will receive
D. has received
常吃海带、裙带菜等.可预防的疾病是( )
A.侏儒症
B.地方性甲状腺肿
C.冠心病
D.糖尿病