皮皮学，免费搜题
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搜题
【单选题】
当船舶改,下列哪项发生变化?A.
差
B.
自差
C.
电罗经差
D.
年差
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】— ____ visited the Shanghai World Expo is sure to tell you the place is worthy ____ twice． — You can say that again．
A.
Those who have; visiting
B.
Whoever has; visiting
C.
Those who have; to be visited
D.
Whoever has; to be visited
【单选题】Was it in the science museum _______ you visited yesterday _______ you left your keys?
A.
that; where
B.
that;/
C.
/; that
D.
where; that