题目内容

An LWT anchor often has difficulty tripping in ______．

A. Sand
B. Soft soil
C. Stiff clay
D. Heterogeneous soil

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锋面雾产生的典型部位是。

A. 暖锋前
B. 暖锋后
C. 第一型冷锋前
D. 第二型冷锋后

Which pump must always be primed ________．

A. Centrifugal pump
B. Reciprocating pump
C. Rotary pump
D. All of the above

艺术体验就是直接参与某种艺术创作活动，感受或表达某种情感。()

A system of reservoirs and connecting tubes in a gyro compass is called a ______．

A. Spider element
B. Mercury ballistic
C. Gyrotron
D. Rotor