In any right triangle, the acute angles are ______.

The tenders Committee ()the right to reject any or all quotations received.

A、is keeping

B、is maintaining

C、reserves

D、reserve

Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to ______.

A.the effects of beam width

B.limitations on range resolution

C.the pulse length of the radar

D.the multiple-target resolution factor

The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?

A.The profile of the valve is like a globe

B.The valve seat is set into the bulbous body

C.The plug or disc of the valve is made vertical to the axis of the pipe

D.The valve seat is located at right side of the plug or disc

In the navigational triangle，the angle at the elevated pole is the ______．

A.meridian angle

B.altitude

C.right ascension

D.azimuth angle

“AMIDSHIPS ” refers to______.

A.Back of the vessel

B.The middle portion of a ship

C.A backward movement of a vessel

D.Across the ship, at right angles to the fore-and-aft centerline

When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to ______.

A.the meridian through the object of the bearing

B.the meridian through the ship's position

C.the meridian midway between the ship and the object

D.any meridian

听力原文：M: Professor Wang, could you tell me the advantage of the preferred shares?

W: Preferred shares have certain rights, such as the preferred right to receive dividends before any ordinary dividends maybe declared.

Q: When do preferred shareholders have right to receive dividends?

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A．Before any ordinary dividends are declared.

B．After any ordinary dividends are declared.

C．Before any ordinary dividends are paid.

D．After any ordinary dividends are paid.