题目内容

What is the advantage of VOR navigation compared with NDB navigation?

A. larger coverage
B. less maintenance
C. greater accuracy
D. higher service altitude

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Which of the following is NOT a disadvantage of VOR navigation?

A. limited range
B. significant cost
C. closer to mountains
D. vulnerable to diffraction

扦插难生根树种最好用( )。

A. 硬枝扦插
B. 嫩枝扦插
C. A+B

扦插难生根树种,在枝龄相同的条件下,应采( )。

A. 树干基部萌芽枝
B. 树干(或苗干)上的一级侧枝
C. 树干上部的枝条

黄化处理促进插穗生根的技术措施之一。

A. 对
B. 错