【单选题】
A <{p}><{font _mstmutation="1" _msthash="20489" _msttexthash="7730398"}>很小时<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msthash="20490" _msttexthash="24166935"}>轮廓方向一致时<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msthash="20491" _msttexthash="9259614"}>很长时<{/font}><{br/}><{/p}>
D <{p}><{br/}><{font _mstmutation="1" _msthash="20492" _msttexthash="17925947"}>距离很近时<{/font}><{br/}><{/p}>
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