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【单选题】
turtle.circle(50,180)的执行效果是A.
绘制一个半径为50的圆弧
B.
绘制一个直径为50的半圆弧
C.
绘制一个半径为50的圆弧，分三次画完
D.
绘制一个半径为50的半圆弧
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举一反三
【单选题】When negotiating with Koreans, which of the following strategies is the most appropriate?
A.
use social activities to establish friendly relations with Korean negotiators
B.
the meeting with South Korea should be agreed one or two days in advance
C.
at the beginning of the negotiation, discuss the main matters immediately to reflect the importance of these matters
D.
if there is a conflict, it should be vigorously defended
【多选题】关于变压器，以下说法正确的有（ ）
A.
变压器负载为纯电阻时， 变压器输入功率既有有功功率，又有无功功率，而输出功率仅有有功功率。
B.
变压器带容性负载时，有可能使额定电压变化率为零。
C.
变压器额定负载运行时，其效率不是定值，而且效率与 负载性质有关。
D.
变压器负载性质一定时，其效率也 不是定值， 而且效率 与负载大小有关。
【单选题】If a letter of credit is confirmed, the beneficiary can ask for payment from ( ) even if the issuing declares bankruptcy and closes down.
A.
the negotiating bank
B.
the buyer
C.
the applicant
D.
the confirming bank
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