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Lesson Two--fill in the blanks with missing callsigns and numbers-1（只填字母和数字，没有空格） 1) PIL: Alpha Control, 1 over 2 at 3 meters, estimating 4 35CTL: Station calling Control, say againyour callsign.

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Lesson Two-Blank-filling-2 2.PIL: Bravo Control, 1 ,over 2 at 3 ,maintaining 4 meters.CTL:5 ,contactBravo Control on 6

Lesson Two- fill in the blanks with the missing callsigns and numbers-3 3. CTL: 1 , confirmyou are maintaining at 2 meters break break 3 stop descent at4 meters.PIL: 5 , affirm, maintaining at6meters.

Lesson Two-fill in the blanks with the missing callsigns and numbers-4 4.CTL: All stations, QNHis now 1 ,correction 2 , wind 3 degrees, 4knots .

设计试验方案的学问叫做试验设计；下列关于试验设计说法不正确的是？

A. 全面实施法的优点是一定可找到所有搭配中最优的方案
B. 全面实施法的缺点是试验次数过多难以实现
C.单因素法的优点是减少了试验次数
D. 正交试验法的缺点是可能找不出最后条件。