Reducing free surfaces has the effect

1、A heated bulkhead has the effect on a

A heated bulkhead has the effect on a hygroscopic commodity of（）.Acausing moisture to accumulate against bulkheadBlowering the vapor pressure of the commodityClowering the dew point of the airDraising the vapor pressure of the commodity

2、The horizontal flat surfaces where the

The horizontal flat surfaces where the upper stock joins the rudder are the（）.Arudder keysBrudder palmsClifting flangesDshoes of the rudder

3、Free communication effect is in direct

Free communication effect is in direct proportion to（）.Alength and width of spaceBlength of space onlyCwidth of space onlyDneither length nor width

4、Reducing the clearance between a valve

Reducing the clearance between a valve stem and rocker arm will result in the valve （）Ahaving a shorter duration of openingBhaving a longer duration of openingCclosing soonerDopening later

5、Reducing the liquid free surfaces in a

Reducing the liquid free surfaces in a vessel reduces the（）.Aroll periodBmetacentric heightCwaterplane areaDvessel's draft

6、One method of reducing the length of r

One method of reducing the length of radio transmissions without distorting the meaning of your words is by using（）.AslangBsecret codesCprocedure wordsDanalogie