埋弧焊的引弧方法有尖焊丝引弧法和焊丝回抽引弧法。( )
参考答案:对
--The English exam is not difficult, is it?
--________. Even Tom ________ to the top students failed in it.
A.Yes; belongs
B.No; belonged
C.Yes; belonging
D.No; belongs
患者男性,72岁。因与家中生气后感到心前区闷痛,并向左肩胛区放射,经硝酸甘油含服后,疼痛缓解。查体:血压180/110mmHg,急性病容、出虚汗,心率92次/分,律齐。
最常用的检查方法是()
A.B超
B.CT
C.血管造影
D.心电图
E.X线片