皮皮学，免费搜题
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【单选题】
VTS通过发布消息的方式提供服务，下列发布的消息中不包括( )。A.
信息-在应船舶要求而播发
B.
建议-VTS通过咨询服务发出的消息
C.
标志-VTS中心认为必要地点采用的标记
D.
指示-为交通控制目的而以命令方式发布的消息
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】请列举各少数民族的饮茶习俗(至少8个)。
【单选题】-It's difficult for the village children to cross the river for school. - I think a bridge _________ over the river. [ ]
A.
was built
B.
is being built
C.
should be built
D.
has been built
【简答题】调节器的积分时间Ti越小，则积分速度越大，积分特性曲线的斜率（），积分作用（），消除余差（）。
【单选题】That sound doesn't ______ in his language, so it's difficult for him to pronounce it.
A.
happen
B.
occur
C.
have
D.
take place
【单选题】—It's difficult for the village children to cross the river for school. —I think a bridge _______ over the river. [ ]
A.
should be built
B.
is being built
C.
has been built
D.
was built
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