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【单选题】
下列使用jQuery为元素添加样式的代码,正确的有()A.
$("p").attr("class", "highlight");
B.
$("p").css("font-weight", "bold");
C.
$("p").css("width;height", "100px;200px");
D.
$("p").addClass("highlight", "");
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【单选题】Diesel engines are considered safer than gasoline engines because ______．
A.
They are more heavily built
B.
The fuel used is less volatile
C.
They can be easily reversed
D.
They operate at a lower speed
【单选题】Diesel engines are classified as reciprocating internal combustion engines because they
A.
rn fuel in a chamber where its energy moves a piston up and down
B.
use energy from fuel burned outside their cylinders
C.
a continuous combustion process to impart rotary motion to the pistons
D.
burn fuel in a combustion chamber that moves back and forth
【单选题】In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should ______.
A.
stop your engines
B.
sound the danger signal at two-minute intervals
C.
hold course and speed until the other vessel is sighted
D.
take avoiding action as soon as possible
【单选题】Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine _____.
A.
camshaft beatings
B.
main bearings
C.
piston crowns
D.
cylinder walls
【单选题】Diesel engines are considered safer than gasoline engines because.
A.
they are more heavily built
B.
the fuel used is less volatile
C.
they can be easily reversed
D.
they operate at a lower speed
【单选题】Diesel engines are classified as reciprocating internal combustion engines because they
A.
use energy from fuel burned outside their cylinders
B.
burn fuel in a combustion chamber that moves back and forth
C.
burn fuel in a chamber where its energy moves a piston back and forth
D.
use a continuous combustion process to impart rotary motion to the pistons
【简答题】下长坡连续使用行车制动会导致什么？
【单选题】Diesel engines are started by supplying into the cylinders in the appropriate sequence for the required direction.
A.
cooling water
B.
compressing air
C.
compressed air
D.
cylinder oil
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