不宜用作甲亢常规治疗的药物是()。
A.碘化物
B.甲基硫氧嘧啶
C.丙基硫氧嘧啶
D.甲巯咪唑
E.卡比马唑
参考答案:A
Paper bags produced every year are ______ the world’s production of vehicles.
A.as three times heavy as
B.three times weight of
C.three times the weight of
D.three times as heavier as
当待并机与系统频率相差太大,断路器合闸时间又难以把握时,可能会造成()。
A.系统崩溃
B.同期并列
C.短路
D.非同期并列