焊接单元板或元器件时,应将电烙铁金属外皮接地。
参考答案:对
— Where is the school singing contest going to be held tonight?
— I am not sure. Is it in the hall _________ the students often have a meeting? [ ]
A. where
B. which
C. that
D. when
男,50岁,不明原因晕厥,心电图示宽QRS波型心动过速,心室率150次/分,血压60/45mmHg。()
A.临时心脏起搏器植入
B.肾上腺素
C.直流电复律
D.毛花苷丙(西地兰)
E.阿托品下列各例治疗应首选