T or F 420The aircraft is making a request for joining the controlled airspace.[音频]
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T or F 418The aircraft will resume IMC flight after passing FL80.[音频]
A. 对
B. 错
T or F 784The aircraft flew at the wrong level due to the pilot’s error.[音频]
A. 对
B. 错
以下砖表面不光洁的是()
A. 玻化砖
B. 釉面砖
C. 通体砖
D. 抛光砖
以下胶粘剂凝固时间最短的是()。
A. 白乳胶
B. 地板乳胶
C. 大理石胶
D. 熟胶粉