T型或倒T型K线的颜色应参照上一交易日的（）而定。
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检查APU点火嘴时，容许清洁点火嘴点火端吗？
A. 容许
B. 不容许
Which statement about active and passive surveys is incorrect？（）
Active mode does not require the client to be specifically confgured
B. Passive mode can survey more than one access point at a time
C. Active mode yields signal-quality information such as packet retries and lost packets
D. Active mode requires more time to survey but yields more information results than passive mode doe
（）是指坯壳出结晶器后受到的冷却。
A. 二次冷却
B. 一次冷却
C. 三次冷却
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