______20 targets can be tracked at one time．When maximum tracking capacity is reached，no further acquisitions(捕获) are possible．
A.As many as
B.So many as
C.As much as
D.As more as
正确答案：A
一次可以获取多达20个物标当跟踪能力达到最大时候就不再录取了
______20targetscanbetrackedatonetime．Whenmaximumtra
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