<option id="r6u09"><label id="r6u09"></label></option>

<legend id="r6u09"><acronym id="r6u09"><pre id="r6u09"></pre></acronym></legend>

單項選擇題

What is the lifesaving signal for，You are seen - assistance will be given as soon as possible?（）

A.Green star rocket
B.Red star rocket
C.Orange smoke signal
D.Horizontal motion of a flag

你可能感興趣的試題

單項選擇題

What is the lifesaving signal for You are seen -assistance will be given as soon as possible?（）

A.3 white star signals
B.Horizontal motion with a white flag
C.Vertical motion of a white light
D.Code letter K by blinker light

單項選擇題

Under the forces of its own weight，the suspended length of line will fall into a shape known as a（）.

A.polygon
B.holding arc
C.catenary curve
D.parabolic curve