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单选题
A gear up emergency landing, if necessary, can be deferred until after all other methods of lowering the gear have been unsuccessfully tried and a suitable landing area has been selected.
A
紧急机腹着陆，如果有必要推迟，可以不成功地尝试所有其他放下起落架的方法，并选择合适的着陆区域之后再执行。
B
如有必要进行紧急机腹着陆，应在尝试所有其他放下起落架的方法都不成功并在已选择合适的着陆区域后再执行。
C
如果有必要推迟紧急机腹着陆，能够在所有其他放下起落架的方法尝试不成功，并选择合适的着陆区域之后再执行。
答案解析
正确答案：B
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