判断题

QT600-3牌号中的两组数字分别表示最低屈服强度和延伸率
正确
错误

答案：错误

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不定项选择

果树的嫁接方法主要有芽接法和枝接法。

A．错误
B．正确

单项选择题

All six cases identified ________ in visitors to the area, and most had very limited exposure to the contaminated water.
A、caused
B、arose
C、rose
D、raised
E、risen