光缆型号的命名，加强构件代号“H”表示（）加强构件。
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小麦播种出苗，土壤适宜的含水量为田间持水量的（）%。
A. <40
B. 60
C. 70-75
D. >85
What are the "bound IP addresses" used for in LDP？（）
A. For each such address and mask /32, one label binding is created.
B. As the TCP endpoint, IP addresses are used by the LDP session.
C. These addresses are used to find the label binding to put in the LFIB, by looking up these IP addresses in the routing table.
D. These addresses are used for penultimate hop popping (PHP) when forwarding packets to the next router directly.&e
吸气式活塞发动机负荷特性，是在哪种条件下得到的（）.
A. 额定进气压力下
B. 节气门全开
C. 一定进气速度
D. 一定大气条件
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