Which is the correct removal sequence of the equipment in the fully mechanized working face? ( ) A: Scraper conveyor, double-drum shearer, retractable belt conveyor, hydraulic support B: Double-drum shearer, retractable belt conveyor, scraper conveyor, hydraulic support C: Double-drum shearer, scraper conveyor, retractable belt conveyor, hydraulic support D: Retractable belt conveyor, double-drum shearer, scraper conveyor, hydraulic support

Please describe the principle of drum pulper. A: There are axial partitions in drum to bring pulp up, and then let them drop B: There is a stir in drum C: produce strong shear and rub of fibers D: produce mild shear and rub of fiber

Drum brake is comprised of two brake shoes, a wheel cylinder, an adjuster, an emergency brake mechanism, a back plate, a lot of return springs, and a brake drum as shown in Fig.5-7．

The steel drum was invented in Trinidad and Tobago in the 1 , and today it’s popular all over the world. It’s hard to believe, but this drum, with its sweet sound, is made from an 2 . On Trinidad and Tobago, you can hear steel drum music on the 3 , in the marketplaces, and especially during the islands’ 4 .

When in face of danger, female gorillas will drum on their chests.

The other drum brake components are located in the brake drum．

The manufacturing method of the Drum Carriage and the Guide Carriage were the same.

Ansai Waist Drum can be divided into “marching”, “site” and “stage” forms.

The lower header is between the drum and the lowering pipe (). A: Right B: Wrong

下面函数定义中正确的是 。 A: double fun(double f1, double f2){ } B: double fun(double f1; double f2){ } C: double fun(double f1, double f2); { } D: double fun(double f1, f2){ }