Which is a benefit of precompiling a JSP page？（）
A. It avoids initialization on the first request.
B. It provides the ability to debug runtime errors in the application.
C. It provides better performance on the first request for the JSP page.
D. It avoids execution of the _jspService method on the first request.
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改变水泥各熟料矿物的含量，可使水泥性质发生相应的变化，要使水泥具有较低的水化热应降低（）含量。
A. GS
B. C2S
C3A
D. C4AF
密接式车钩的客车回送时，原则上应附旅客列车回送。附挂货物列车回送时，应挂于尾部，但不得超过（）。
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