焊接电压的大小对焊缝的宽窄没有影响。
参考答案：错
______ two exams to worry about, I have to work really hard this weekend. [ ]
A. With
B. Besides
C. As for
D. Because of
窦性心动过速宜选用的药物是
A．奎尼丁B．阿托品C．普萘洛尔D．维拉帕米E．利多卡因
