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【单选题】
A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means _____.A.
a pressure reducing valve
B.
a pilot valve
C.
an operating piston
D.
downstream pressure
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反馈参考答案：
举一反三
【单选题】影响小儿生长发育的因素中，下列哪项是错误的：
A.
小儿生长发育与父母的种族、身材有关
B.
小儿生长发育与营养有关
C.
小儿生长发育与生活环境有关
D.
小儿生长发育与教养和锻炼无关
E.
小儿生长发育与疾病有关
【单选题】--- Can you spell your name, please? --- Yes, I _________.
A.
do
B.
can
C.
can't
D.
am
【单选题】---Mr Wang, I have trouble ________ the text. ---I’m sure you can, but remember ________ it at least three times.
A.
to understand; reading
B.
understanding; reading
C.
to understand; to read
D.
understanding; to read
参考解析：
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