如何获得R语言中安装的所有软件包的列表？ A: installed.packages() B: install.packages() C: installed() D: packages()

It was found upon examination that nearly 20% of the____has been broken, obviously due to improper____. A: packing, packages B: packages, packing C: packing, packing D: packages, packages

The machine ______, the next step was how to operate it. A: having been installed B: B．had been installed C: having being installed D: has been installed

Why is the platform of the warehouse installed with a dock-leveler? It is installed with a dock-leveler to have smooth cargo ____ ____ ____.

It is advisable to arrange the smaller packages put under the largest and empty packages among other packages.

A set of are installed to control

They are going to have the serviceman______an electric fan in the officetomorrow.(1998.1.CET-4) A: install B: to install C: to be installed D: installed

They are going to have the serviceman ________ an air-conditioner in the office next week. A: install B: to install C: to be installed D: installed

Which two statements about packages are true?() A: Packages can be nested B: You can pass parameters to packages C: A package is loaded into memory each time it is invoked D: The contents of packages can be shared by many applications E: You can achieve information hiding by making package constructs private

Once installed, this heater operates____________.